nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "symbol_t.h"
  39 #include "token_t.h"
  40 #include "type_t.h"
  41 #include "ast_t.h"
  42 #include "entity_t.h"
  43 #include "parser.h"
  44 #include "diagnostic.h"
  45 #include "lang_features.h"
  46 #include "types.h"
  47 #include "type_hash.h"
  48 #include "mangle.h"
  49 #include "walk.h"
  50 #include "warning.h"
  51 #include "printer.h"
  52 #include "entitymap_t.h"
  53 #include "driver/firm_opt.h"
  54
  55 typedef struct trampoline_region trampoline_region;
  56 struct trampoline_region {
  57         ir_entity        *function;    /**< The function that is called by this trampoline */
  58         ir_entity        *region;      /**< created region for the trampoline */
  59 };
  60
  61 fp_model_t firm_fp_model = fp_model_precise;
  62
  63 static const backend_params *be_params;
  64
  65 static ir_type *ir_type_char;
  66 static ir_type *ir_type_const_char;
  67 static ir_type *ir_type_wchar_t;
  68
  69 /* architecture specific floating point arithmetic mode (if any) */
  70 static ir_mode *mode_float_arithmetic;
  71
  72 /* alignment of stack parameters */
  73 static unsigned stack_param_align;
  74
  75 static int        next_value_number_function;
  76 static ir_node   *continue_label;
  77 static ir_node   *break_label;
  78 static ir_node   *current_switch;
  79 static bool       saw_default_label;
  80 static label_t  **all_labels;
  81 static entity_t **inner_functions;
  82 static ir_node   *ijmp_list;
  83 static bool       constant_folding;
  84
  85 static const entity_t     *current_function_entity;
  86 static ir_node            *current_function_name;
  87 static ir_node            *current_funcsig;
  88 static ir_graph           *current_function;
  89 static translation_unit_t *current_translation_unit;
  90 static trampoline_region  *current_trampolines;
  91 static ir_type            *current_outer_frame;
  92 static ir_node            *current_static_link;
  93 static ir_entity          *current_vararg_entity;
  94
  95 static entitymap_t  entitymap;
  96
  97 static struct obstack asm_obst;
  98
  99 typedef enum declaration_kind_t {
 100         DECLARATION_KIND_UNKNOWN,
 101         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 102         DECLARATION_KIND_GLOBAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE,
 104         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 105         DECLARATION_KIND_PARAMETER,
 106         DECLARATION_KIND_PARAMETER_ENTITY,
 107         DECLARATION_KIND_FUNCTION,
 108         DECLARATION_KIND_COMPOUND_MEMBER,
 109         DECLARATION_KIND_INNER_FUNCTION
 110 } declaration_kind_t;
 111
 112 static ir_type *get_ir_type_incomplete(type_t *type);
 113
 114 static void enqueue_inner_function(entity_t *entity)
 115 {
 116         if (inner_functions == NULL)
 117                 inner_functions = NEW_ARR_F(entity_t *, 0);
 118         ARR_APP1(entity_t*, inner_functions, entity);
 119 }
 120
 121 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 122 {
 123         const entity_t *entity = get_irg_loc_description(irg, pos);
 124
 125         if (entity != NULL) {
 126                 source_position_t const *const pos = &entity->base.source_position;
 127                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 128         }
 129         return new_r_Unknown(irg, mode);
 130 }
 131
 132 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 133 {
 134         source_position_t const *const pos = (source_position_t const*)dbg;
 135         if (pos) {
 136                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 137         } else {
 138                 return (src_loc_t){ NULL, 0, 0 };
 139         }
 140 }
 141
 142 static dbg_info *get_dbg_info(const source_position_t *pos)
 143 {
 144         return (dbg_info*) pos;
 145 }
 146
 147 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 148                                     const type_dbg_info *dbg)
 149 {
 150         assert(dbg != NULL);
 151         print_to_buffer(buffer, buffer_size);
 152         const type_t *type = (const type_t*) dbg;
 153         print_type(type);
 154         finish_print_to_buffer();
 155 }
 156
 157 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 158 {
 159         return (type_dbg_info*) type;
 160 }
 161
 162 /* is the current block a reachable one? */
 163 static bool currently_reachable(void)
 164 {
 165         ir_node *const block = get_cur_block();
 166         return block != NULL && !is_Bad(block);
 167 }
 168
 169 static void set_unreachable_now(void)
 170 {
 171         set_cur_block(NULL);
 172 }
 173
 174 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 175
 176 static ir_node *_expression_to_firm(const expression_t *expression);
 177 static ir_node *expression_to_firm(const expression_t *expression);
 178 static void create_local_declaration(entity_t *entity);
 179
 180 static unsigned decide_modulo_shift(unsigned type_size)
 181 {
 182         if (architecture_modulo_shift == 0)
 183                 return 0;
 184         if (type_size < architecture_modulo_shift)
 185                 return architecture_modulo_shift;
 186         return type_size;
 187 }
 188
 189 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 190 {
 191         unsigned flags = get_atomic_type_flags(kind);
 192         unsigned size  = get_atomic_type_size(kind);
 193         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 194             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 195                 if (size == 4) {
 196                         return get_modeF();
 197                 } else if (size == 8) {
 198                         return get_modeD();
 199                 } else {
 200                         panic("unexpected kind");
 201                 }
 202         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 203                 char            name[64];
 204                 unsigned        bit_size     = size * 8;
 205                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 206                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 207
 208                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 209                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 210                                     modulo_shift);
 211         }
 212
 213         return NULL;
 214 }
 215
 216 /**
 217  * Initialises the atomic modes depending on the machine size.
 218  */
 219 static void init_atomic_modes(void)
 220 {
 221         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 222         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 223                 if (atomic_modes[i] != NULL)
 224                         continue;
 225                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 226         }
 227 }
 228
 229 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 230 {
 231         assert(kind <= ATOMIC_TYPE_LAST);
 232         return atomic_modes[kind];
 233 }
 234
 235 static ir_node *get_vla_size(array_type_t *const type)
 236 {
 237         ir_node *size_node = type->size_node;
 238         if (size_node == NULL) {
 239                 size_node = expression_to_firm(type->size_expression);
 240                 type->size_node = size_node;
 241         }
 242         return size_node;
 243 }
 244
 245 static unsigned count_parameters(const function_type_t *function_type)
 246 {
 247         unsigned count = 0;
 248
 249         function_parameter_t *parameter = function_type->parameters;
 250         for ( ; parameter != NULL; parameter = parameter->next) {
 251                 ++count;
 252         }
 253
 254         return count;
 255 }
 256
 257 /**
 258  * Creates a Firm type for an atomic type
 259  */
 260 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 261 {
 262         ir_mode        *mode      = atomic_modes[akind];
 263         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 264         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 265         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 266
 267         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 268         set_type_alignment_bytes(irtype, alignment);
 269
 270         return irtype;
 271 }
 272
 273 /**
 274  * Creates a Firm type for a complex type
 275  */
 276 static ir_type *create_complex_type(const atomic_type_t *type)
 277 {
 278         atomic_type_kind_t  kind = type->akind;
 279         ir_mode            *mode = atomic_modes[kind];
 280         ident              *id   = get_mode_ident(mode);
 281
 282         (void) id;
 283
 284         /* FIXME: finish the array */
 285         return NULL;
 286 }
 287
 288 /**
 289  * Creates a Firm type for an imaginary type
 290  */
 291 static ir_type *create_imaginary_type(const atomic_type_t *type)
 292 {
 293         return create_atomic_type(type->akind, (const type_t*)type);
 294 }
 295
 296 /**
 297  * return type of a parameter (and take transparent union gnu extension into
 298  * account)
 299  */
 300 static type_t *get_parameter_type(type_t *orig_type)
 301 {
 302         type_t *type = skip_typeref(orig_type);
 303         if (is_type_union(type)
 304                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 305                 compound_t *compound = type->compound.compound;
 306                 type                 = compound->members.entities->declaration.type;
 307         }
 308
 309         return type;
 310 }
 311
 312 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 313 {
 314         type_t        *return_type  = skip_typeref(function_type->return_type);
 315
 316         int            n_parameters = count_parameters(function_type)
 317                                        + (for_closure ? 1 : 0);
 318         int            n_results    = is_type_void(return_type) ? 0 : 1;
 319         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 320         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 321
 322         if (!is_type_void(return_type)) {
 323                 ir_type *restype = get_ir_type(return_type);
 324                 set_method_res_type(irtype, 0, restype);
 325         }
 326
 327         function_parameter_t *parameter = function_type->parameters;
 328         int                   n         = 0;
 329         if (for_closure) {
 330                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 331                 set_method_param_type(irtype, n, p_irtype);
 332                 ++n;
 333         }
 334         for ( ; parameter != NULL; parameter = parameter->next) {
 335                 type_t  *type     = get_parameter_type(parameter->type);
 336                 ir_type *p_irtype = get_ir_type(type);
 337                 set_method_param_type(irtype, n, p_irtype);
 338                 ++n;
 339         }
 340
 341         bool is_variadic = function_type->variadic;
 342
 343         if (is_variadic)
 344                 set_method_variadicity(irtype, variadicity_variadic);
 345
 346         unsigned cc = get_method_calling_convention(irtype);
 347         switch (function_type->calling_convention) {
 348         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 349         case CC_CDECL:
 350 is_cdecl:
 351                 set_method_calling_convention(irtype, SET_CDECL(cc));
 352                 break;
 353
 354         case CC_STDCALL:
 355                 if (is_variadic)
 356                         goto is_cdecl;
 357
 358                 /* only non-variadic function can use stdcall, else use cdecl */
 359                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 360                 break;
 361
 362         case CC_FASTCALL:
 363                 if (is_variadic)
 364                         goto is_cdecl;
 365                 /* only non-variadic function can use fastcall, else use cdecl */
 366                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 367                 break;
 368
 369         case CC_THISCALL:
 370                 /* Hmm, leave default, not accepted by the parser yet. */
 371                 break;
 372         }
 373
 374         if (for_closure)
 375                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 376
 377         const decl_modifiers_t modifiers = function_type->modifiers;
 378         if (modifiers & DM_CONST)
 379                 add_method_additional_properties(irtype, mtp_property_const);
 380         if (modifiers & DM_PURE)
 381                 add_method_additional_properties(irtype, mtp_property_pure);
 382         if (modifiers & DM_RETURNS_TWICE)
 383                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 384         if (modifiers & DM_NORETURN)
 385                 add_method_additional_properties(irtype, mtp_property_noreturn);
 386         if (modifiers & DM_NOTHROW)
 387                 add_method_additional_properties(irtype, mtp_property_nothrow);
 388         if (modifiers & DM_MALLOC)
 389                 add_method_additional_properties(irtype, mtp_property_malloc);
 390
 391         return irtype;
 392 }
 393
 394 static ir_type *create_pointer_type(pointer_type_t *type)
 395 {
 396         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 397         type_t        *points_to    = type->points_to;
 398         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 399         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 400
 401         return irtype;
 402 }
 403
 404 static ir_type *create_reference_type(reference_type_t *type)
 405 {
 406         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 407         type_t        *refers_to    = type->refers_to;
 408         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 409         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 410
 411         return irtype;
 412 }
 413
 414 static ir_type *create_array_type(array_type_t *type)
 415 {
 416         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 417         type_t        *element_type    = type->element_type;
 418         ir_type       *ir_element_type = get_ir_type(element_type);
 419         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 420
 421         const int align = get_type_alignment_bytes(ir_element_type);
 422         set_type_alignment_bytes(irtype, align);
 423
 424         if (type->size_constant) {
 425                 int n_elements = type->size;
 426
 427                 set_array_bounds_int(irtype, 0, 0, n_elements);
 428
 429                 size_t elemsize = get_type_size_bytes(ir_element_type);
 430                 if (elemsize % align > 0) {
 431                         elemsize += align - (elemsize % align);
 432                 }
 433                 set_type_size_bytes(irtype, n_elements * elemsize);
 434         } else {
 435                 set_array_lower_bound_int(irtype, 0, 0);
 436         }
 437         set_type_state(irtype, layout_fixed);
 438
 439         return irtype;
 440 }
 441
 442 /**
 443  * Return the signed integer type of size bits.
 444  *
 445  * @param size   the size
 446  */
 447 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 448                                                  unsigned size,
 449                                                                                                  const type_t *type)
 450 {
 451         static ir_mode *s_modes[64 + 1] = {NULL, };
 452         ir_type *res;
 453         ir_mode *mode;
 454
 455         if (size <= 0 || size > 64)
 456                 return NULL;
 457
 458         mode = s_modes[size];
 459         if (mode == NULL) {
 460                 char name[32];
 461
 462                 snprintf(name, sizeof(name), "bf_I%u", size);
 463                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 464                 s_modes[size] = mode;
 465         }
 466
 467         type_dbg_info *dbgi = get_type_dbg_info_(type);
 468         res                 = new_d_type_primitive(mode, dbgi);
 469         set_primitive_base_type(res, base_tp);
 470
 471         return res;
 472 }
 473
 474 /**
 475  * Return the unsigned integer type of size bits.
 476  *
 477  * @param size   the size
 478  */
 479 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 480                                                    unsigned size,
 481                                                                                                    const type_t *type)
 482 {
 483         static ir_mode *u_modes[64 + 1] = {NULL, };
 484         ir_type *res;
 485         ir_mode *mode;
 486
 487         if (size <= 0 || size > 64)
 488                 return NULL;
 489
 490         mode = u_modes[size];
 491         if (mode == NULL) {
 492                 char name[32];
 493
 494                 snprintf(name, sizeof(name), "bf_U%u", size);
 495                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 496                 u_modes[size] = mode;
 497         }
 498
 499         type_dbg_info *dbgi = get_type_dbg_info_(type);
 500         res = new_d_type_primitive(mode, dbgi);
 501         set_primitive_base_type(res, base_tp);
 502
 503         return res;
 504 }
 505
 506 static ir_type *create_bitfield_type(const entity_t *entity)
 507 {
 508         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 509         type_t *base = skip_typeref(entity->declaration.type);
 510         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 511         ir_type *irbase = get_ir_type(base);
 512
 513         unsigned bit_size = entity->compound_member.bit_size;
 514
 515         assert(!is_type_float(base));
 516         if (is_type_signed(base)) {
 517                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 518         } else {
 519                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 520         }
 521 }
 522
 523 /**
 524  * Construct firm type from ast struct type.
 525  */
 526 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 527 {
 528         compound_t *compound = type->compound;
 529
 530         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 531                 return compound->irtype;
 532         }
 533
 534         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 535
 536         symbol_t *type_symbol = compound->base.symbol;
 537         ident    *id;
 538         if (type_symbol != NULL) {
 539                 id = new_id_from_str(type_symbol->string);
 540         } else {
 541                 if (is_union) {
 542                         id = id_unique("__anonymous_union.%u");
 543                 } else {
 544                         id = id_unique("__anonymous_struct.%u");
 545                 }
 546         }
 547
 548         ir_type *irtype;
 549         if (is_union) {
 550                 irtype = new_type_union(id);
 551         } else {
 552                 irtype = new_type_struct(id);
 553         }
 554
 555         compound->irtype_complete = false;
 556         compound->irtype          = irtype;
 557
 558         if (incomplete)
 559                 return irtype;
 560
 561         if (is_union) {
 562                 layout_union_type(type);
 563         } else {
 564                 layout_struct_type(type);
 565         }
 566
 567         compound->irtype_complete = true;
 568
 569         entity_t *entry = compound->members.entities;
 570         for ( ; entry != NULL; entry = entry->base.next) {
 571                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 572                         continue;
 573
 574                 symbol_t *symbol     = entry->base.symbol;
 575                 type_t   *entry_type = entry->declaration.type;
 576                 ident    *ident;
 577                 if (symbol == NULL) {
 578                         /* anonymous bitfield member, skip */
 579                         if (entry->compound_member.bitfield)
 580                                 continue;
 581                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 582                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 583                         ident = id_unique("anon.%u");
 584                 } else {
 585                         ident = new_id_from_str(symbol->string);
 586                 }
 587
 588                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 589
 590                 ir_type *entry_irtype;
 591                 if (entry->compound_member.bitfield) {
 592                         entry_irtype = create_bitfield_type(entry);
 593                 } else {
 594                         entry_irtype = get_ir_type(entry_type);
 595                 }
 596                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 597
 598                 set_entity_offset(entity, entry->compound_member.offset);
 599                 set_entity_offset_bits_remainder(entity,
 600                                                  entry->compound_member.bit_offset);
 601
 602                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 603                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 604                 entry->compound_member.entity = entity;
 605         }
 606
 607         set_type_alignment_bytes(irtype, compound->alignment);
 608         set_type_size_bytes(irtype, compound->size);
 609         set_type_state(irtype, layout_fixed);
 610
 611         return irtype;
 612 }
 613
 614 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 615
 616 static void determine_enum_values(enum_type_t *const type)
 617 {
 618         ir_mode   *const mode    = atomic_modes[type->base.akind];
 619         ir_tarval *const one     = get_mode_one(mode);
 620         ir_tarval *      tv_next = get_mode_null(mode);
 621
 622         enum_t   *enume = type->enume;
 623         entity_t *entry = enume->base.next;
 624         for (; entry != NULL; entry = entry->base.next) {
 625                 if (entry->kind != ENTITY_ENUM_VALUE)
 626                         break;
 627
 628                 expression_t *const init = entry->enum_value.value;
 629                 if (init != NULL) {
 630                         tv_next = fold_constant_to_tarval(init);
 631                 }
 632                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 633                 entry->enum_value.tv = tv_next;
 634                 tv_next = tarval_add(tv_next, one);
 635         }
 636 }
 637
 638 static ir_type *create_enum_type(enum_type_t *const type)
 639 {
 640         return create_atomic_type(type->base.akind, (const type_t*) type);
 641 }
 642
 643 static ir_type *get_ir_type_incomplete(type_t *type)
 644 {
 645         assert(type != NULL);
 646         type = skip_typeref(type);
 647
 648         if (type->base.firm_type != NULL) {
 649                 return type->base.firm_type;
 650         }
 651
 652         if (is_type_compound(type)) {
 653                 return create_compound_type(&type->compound, true);
 654         } else {
 655                 return get_ir_type(type);
 656         }
 657 }
 658
 659 ir_type *get_ir_type(type_t *type)
 660 {
 661         assert(type != NULL);
 662
 663         type = skip_typeref(type);
 664
 665         if (type->base.firm_type != NULL) {
 666                 return type->base.firm_type;
 667         }
 668
 669         ir_type *firm_type = NULL;
 670         switch (type->kind) {
 671         case TYPE_ATOMIC:
 672                 firm_type = create_atomic_type(type->atomic.akind, type);
 673                 break;
 674         case TYPE_COMPLEX:
 675                 firm_type = create_complex_type(&type->atomic);
 676                 break;
 677         case TYPE_IMAGINARY:
 678                 firm_type = create_imaginary_type(&type->atomic);
 679                 break;
 680         case TYPE_FUNCTION:
 681                 firm_type = create_method_type(&type->function, false);
 682                 break;
 683         case TYPE_POINTER:
 684                 firm_type = create_pointer_type(&type->pointer);
 685                 break;
 686         case TYPE_REFERENCE:
 687                 firm_type = create_reference_type(&type->reference);
 688                 break;
 689         case TYPE_ARRAY:
 690                 firm_type = create_array_type(&type->array);
 691                 break;
 692         case TYPE_COMPOUND_STRUCT:
 693         case TYPE_COMPOUND_UNION:
 694                 firm_type = create_compound_type(&type->compound, false);
 695                 break;
 696         case TYPE_ENUM:
 697                 firm_type = create_enum_type(&type->enumt);
 698                 break;
 699
 700         case TYPE_ERROR:
 701         case TYPE_TYPEOF:
 702         case TYPE_TYPEDEF:
 703                 break;
 704         }
 705         if (firm_type == NULL)
 706                 panic("unknown type found");
 707
 708         type->base.firm_type = firm_type;
 709         return firm_type;
 710 }
 711
 712 static ir_mode *get_ir_mode_storage(type_t *type)
 713 {
 714         type = skip_typeref(type);
 715
 716         /* Firm doesn't report a mode for arrays and structs/unions. */
 717         if (!is_type_scalar(type)) {
 718                 return mode_P_data;
 719         }
 720
 721         ir_type *const irtype = get_ir_type(type);
 722         ir_mode *const mode   = get_type_mode(irtype);
 723         assert(mode != NULL);
 724         return mode;
 725 }
 726
 727 /*
 728  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 729  * int that it returns bigger modes for floating point on some platforms
 730  * (x87 internally does arithemtic with 80bits)
 731  */
 732 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 733 {
 734         ir_mode *mode = get_ir_mode_storage(type);
 735         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 736                 return mode_float_arithmetic;
 737         }
 738
 739         return mode;
 740 }
 741
 742 /**
 743  * Return a node representing the size of a type.
 744  */
 745 static ir_node *get_type_size_node(type_t *type)
 746 {
 747         unsigned size;
 748         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 749         type = skip_typeref(type);
 750
 751         if (is_type_array(type) && type->array.is_vla) {
 752                 ir_node *size_node = get_vla_size(&type->array);
 753                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 754                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 755                 return real_size;
 756         }
 757
 758         size = get_type_size(type);
 759         return new_Const_long(mode, size);
 760 }
 761
 762 /** Names of the runtime functions. */
 763 static const struct {
 764         int        id;           /**< the rts id */
 765         int        n_res;        /**< number of return values */
 766         const char *name;        /**< the name of the rts function */
 767         int        n_params;     /**< number of parameters */
 768         unsigned   flags;        /**< language flags */
 769 } rts_data[] = {
 770         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 771         { rts_abort,      0, "abort",        0, _C89 },
 772         { rts_alloca,     1, "alloca",       1, _ALL },
 773         { rts_abs,        1, "abs",          1, _C89 },
 774         { rts_labs,       1, "labs",         1, _C89 },
 775         { rts_llabs,      1, "llabs",        1, _C99 },
 776         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 777
 778         { rts_fabs,       1, "fabs",         1, _C89 },
 779         { rts_sqrt,       1, "sqrt",         1, _C89 },
 780         { rts_cbrt,       1, "cbrt",         1, _C99 },
 781         { rts_exp,        1, "exp",          1, _C89 },
 782         { rts_exp2,       1, "exp2",         1, _C89 },
 783         { rts_exp10,      1, "exp10",        1, _GNUC },
 784         { rts_log,        1, "log",          1, _C89 },
 785         { rts_log2,       1, "log2",         1, _C89 },
 786         { rts_log10,      1, "log10",        1, _C89 },
 787         { rts_pow,        1, "pow",          2, _C89 },
 788         { rts_sin,        1, "sin",          1, _C89 },
 789         { rts_cos,        1, "cos",          1, _C89 },
 790         { rts_tan,        1, "tan",          1, _C89 },
 791         { rts_asin,       1, "asin",         1, _C89 },
 792         { rts_acos,       1, "acos",         1, _C89 },
 793         { rts_atan,       1, "atan",         1, _C89 },
 794         { rts_sinh,       1, "sinh",         1, _C89 },
 795         { rts_cosh,       1, "cosh",         1, _C89 },
 796         { rts_tanh,       1, "tanh",         1, _C89 },
 797
 798         { rts_fabsf,      1, "fabsf",        1, _C99 },
 799         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 800         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 801         { rts_expf,       1, "expf",         1, _C99 },
 802         { rts_exp2f,      1, "exp2f",        1, _C99 },
 803         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 804         { rts_logf,       1, "logf",         1, _C99 },
 805         { rts_log2f,      1, "log2f",        1, _C99 },
 806         { rts_log10f,     1, "log10f",       1, _C99 },
 807         { rts_powf,       1, "powf",         2, _C99 },
 808         { rts_sinf,       1, "sinf",         1, _C99 },
 809         { rts_cosf,       1, "cosf",         1, _C99 },
 810         { rts_tanf,       1, "tanf",         1, _C99 },
 811         { rts_asinf,      1, "asinf",        1, _C99 },
 812         { rts_acosf,      1, "acosf",        1, _C99 },
 813         { rts_atanf,      1, "atanf",        1, _C99 },
 814         { rts_sinhf,      1, "sinhf",        1, _C99 },
 815         { rts_coshf,      1, "coshf",        1, _C99 },
 816         { rts_tanhf,      1, "tanhf",        1, _C99 },
 817
 818         { rts_fabsl,      1, "fabsl",        1, _C99 },
 819         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 820         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 821         { rts_expl,       1, "expl",         1, _C99 },
 822         { rts_exp2l,      1, "exp2l",        1, _C99 },
 823         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 824         { rts_logl,       1, "logl",         1, _C99 },
 825         { rts_log2l,      1, "log2l",        1, _C99 },
 826         { rts_log10l,     1, "log10l",       1, _C99 },
 827         { rts_powl,       1, "powl",         2, _C99 },
 828         { rts_sinl,       1, "sinl",         1, _C99 },
 829         { rts_cosl,       1, "cosl",         1, _C99 },
 830         { rts_tanl,       1, "tanl",         1, _C99 },
 831         { rts_asinl,      1, "asinl",        1, _C99 },
 832         { rts_acosl,      1, "acosl",        1, _C99 },
 833         { rts_atanl,      1, "atanl",        1, _C99 },
 834         { rts_sinhl,      1, "sinhl",        1, _C99 },
 835         { rts_coshl,      1, "coshl",        1, _C99 },
 836         { rts_tanhl,      1, "tanhl",        1, _C99 },
 837
 838         { rts_strcmp,     1, "strcmp",       2, _C89 },
 839         { rts_strncmp,    1, "strncmp",      3, _C89 },
 840         { rts_strcpy,     1, "strcpy",       2, _C89 },
 841         { rts_strlen,     1, "strlen",       1, _C89 },
 842         { rts_memcpy,     1, "memcpy",       3, _C89 },
 843         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 844         { rts_memmove,    1, "memmove",      3, _C89 },
 845         { rts_memset,     1, "memset",       3, _C89 },
 846         { rts_memcmp,     1, "memcmp",       3, _C89 },
 847 };
 848
 849 static ident *rts_idents[lengthof(rts_data)];
 850
 851 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 852
 853 void set_create_ld_ident(ident *(*func)(entity_t*))
 854 {
 855         create_ld_ident = func;
 856 }
 857
 858 /**
 859  * Handle GNU attributes for entities
 860  *
 861  * @param ent   the entity
 862  * @param decl  the routine declaration
 863  */
 864 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 865 {
 866         assert(is_declaration(entity));
 867         decl_modifiers_t modifiers = entity->declaration.modifiers;
 868
 869         if (is_method_entity(irentity)) {
 870                 if (modifiers & DM_PURE) {
 871                         set_entity_additional_properties(irentity, mtp_property_pure);
 872                 }
 873                 if (modifiers & DM_CONST) {
 874                         add_entity_additional_properties(irentity, mtp_property_const);
 875                 }
 876         }
 877         if (modifiers & DM_USED) {
 878                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 879         }
 880         if (modifiers & DM_WEAK) {
 881                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 882         }
 883 }
 884
 885 static bool is_main(entity_t *entity)
 886 {
 887         static symbol_t *sym_main = NULL;
 888         if (sym_main == NULL) {
 889                 sym_main = symbol_table_insert("main");
 890         }
 891
 892         if (entity->base.symbol != sym_main)
 893                 return false;
 894         /* must be in outermost scope */
 895         if (entity->base.parent_scope != &current_translation_unit->scope)
 896                 return false;
 897
 898         return true;
 899 }
 900
 901 /**
 902  * Creates an entity representing a function.
 903  *
 904  * @param entity       the function declaration/definition
 905  * @param owner_type   the owner type of this function, NULL
 906  *                     for global functions
 907  */
 908 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 909 {
 910         assert(entity->kind == ENTITY_FUNCTION);
 911         if (entity->function.irentity != NULL)
 912                 return entity->function.irentity;
 913
 914         switch (entity->function.btk) {
 915         case BUILTIN_NONE:
 916         case BUILTIN_LIBC:
 917         case BUILTIN_LIBC_CHECK:
 918                 break;
 919         default:
 920                 return NULL;
 921         }
 922
 923         if (is_main(entity)) {
 924                 /* force main to C linkage */
 925                 type_t *type = entity->declaration.type;
 926                 assert(is_type_function(type));
 927                 if (type->function.linkage != LINKAGE_C) {
 928                         type_t *new_type           = duplicate_type(type);
 929                         new_type->function.linkage = LINKAGE_C;
 930                         type                       = identify_new_type(new_type);
 931                         entity->declaration.type   = type;
 932                 }
 933         }
 934
 935         symbol_t *symbol = entity->base.symbol;
 936         ident    *id     = new_id_from_str(symbol->string);
 937
 938         /* already an entity defined? */
 939         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 940         bool const has_body = entity->function.statement != NULL;
 941         if (irentity != NULL) {
 942                 if (get_entity_visibility(irentity) == ir_visibility_external
 943                                 && has_body) {
 944                         set_entity_visibility(irentity, ir_visibility_default);
 945                 }
 946                 goto entity_created;
 947         }
 948
 949         ir_type *ir_type_method;
 950         if (entity->function.need_closure)
 951                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 952         else
 953                 ir_type_method = get_ir_type(entity->declaration.type);
 954
 955         bool nested_function = false;
 956         if (owner_type == NULL)
 957                 owner_type = get_glob_type();
 958         else
 959                 nested_function = true;
 960
 961         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 962         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 963
 964         ident *ld_id;
 965         if (nested_function)
 966                 ld_id = id_unique("inner.%u");
 967         else
 968                 ld_id = create_ld_ident(entity);
 969         set_entity_ld_ident(irentity, ld_id);
 970
 971         handle_decl_modifiers(irentity, entity);
 972
 973         if (! nested_function) {
 974                 /* static inline             => local
 975                  * extern inline             => local
 976                  * inline without definition => local
 977                  * inline with definition    => external_visible */
 978                 storage_class_tag_t const storage_class
 979                         = (storage_class_tag_t) entity->declaration.storage_class;
 980                 bool                const is_inline     = entity->function.is_inline;
 981
 982                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
 983                     set_entity_visibility(irentity, ir_visibility_default);
 984                 } else if (storage_class == STORAGE_CLASS_STATIC ||
 985                            (is_inline && has_body)) {
 986                     set_entity_visibility(irentity, ir_visibility_local);
 987                 } else if (has_body) {
 988                     set_entity_visibility(irentity, ir_visibility_default);
 989                 } else {
 990                     set_entity_visibility(irentity, ir_visibility_external);
 991                 }
 992         } else {
 993                 /* nested functions are always local */
 994                 set_entity_visibility(irentity, ir_visibility_local);
 995         }
 996
 997         /* We should check for file scope here, but as long as we compile C only
 998            this is not needed. */
 999         if (!freestanding && !has_body) {
1000                 /* check for a known runtime function */
1001                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1002                         if (id != rts_idents[i])
1003                                 continue;
1004
1005                         function_type_t *function_type
1006                                 = &entity->declaration.type->function;
1007                         /* rts_entities code can't handle a "wrong" number of parameters */
1008                         if (function_type->unspecified_parameters)
1009                                 continue;
1010
1011                         /* check number of parameters */
1012                         int n_params = count_parameters(function_type);
1013                         if (n_params != rts_data[i].n_params)
1014                                 continue;
1015
1016                         type_t *return_type = skip_typeref(function_type->return_type);
1017                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1018                         if (n_res != rts_data[i].n_res)
1019                                 continue;
1020
1021                         /* ignore those rts functions not necessary needed for current mode */
1022                         if ((c_mode & rts_data[i].flags) == 0)
1023                                 continue;
1024                         assert(rts_entities[rts_data[i].id] == NULL);
1025                         rts_entities[rts_data[i].id] = irentity;
1026                 }
1027         }
1028
1029         entitymap_insert(&entitymap, symbol, irentity);
1030
1031 entity_created:
1032         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1033         entity->function.irentity = irentity;
1034
1035         return irentity;
1036 }
1037
1038 /**
1039  * Creates a SymConst for a given entity.
1040  *
1041  * @param dbgi    debug info
1042  * @param entity  the entity
1043  */
1044 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1045 {
1046         assert(entity != NULL);
1047         union symconst_symbol sym;
1048         sym.entity_p = entity;
1049         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1050 }
1051
1052 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1053 {
1054         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1055 }
1056
1057 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1058                                    ir_mode *dest_mode)
1059 {
1060         if (is_Const(value)) {
1061                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1062         }
1063
1064         ir_node *cond       = new_d_Cond(dbgi, value);
1065         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1066         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1067         ir_node *tblock     = new_Block(1, &proj_true);
1068         ir_node *fblock     = new_Block(1, &proj_false);
1069         set_cur_block(tblock);
1070         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1071         ir_node *tjump  = new_Jmp();
1072         set_cur_block(fblock);
1073         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1074         ir_node *fjump  = new_Jmp();
1075
1076         ir_node *in[2]      = { tjump, fjump };
1077         ir_node *mergeblock = new_Block(2, in);
1078         set_cur_block(mergeblock);
1079         ir_node *phi_in[2]  = { const1, const0 };
1080         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1081         return phi;
1082 }
1083
1084 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1085 {
1086         ir_mode *value_mode = get_irn_mode(value);
1087
1088         if (value_mode == dest_mode)
1089                 return value;
1090
1091         if (dest_mode == mode_b) {
1092                 ir_node *zero = new_Const(get_mode_null(value_mode));
1093                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1094                 return cmp;
1095         } else if (value_mode == mode_b) {
1096                 return create_conv_from_b(dbgi, value, dest_mode);
1097         }
1098
1099         return new_d_Conv(dbgi, value, dest_mode);
1100 }
1101
1102 /**
1103  * Creates a SymConst node representing a wide string literal.
1104  *
1105  * @param literal   the wide string literal
1106  */
1107 static ir_node *wide_string_literal_to_firm(
1108                 const string_literal_expression_t *literal)
1109 {
1110         ir_type  *const global_type = get_glob_type();
1111         ir_type  *const elem_type   = ir_type_wchar_t;
1112         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1113         ir_type  *const type        = new_type_array(1, elem_type);
1114
1115         ident     *const id     = id_unique("str.%u");
1116         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1117         set_entity_ld_ident(entity, id);
1118         set_entity_visibility(entity, ir_visibility_private);
1119         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1120
1121         ir_mode      *const mode = get_type_mode(elem_type);
1122         const size_t        slen = wstrlen(&literal->value);
1123
1124         set_array_lower_bound_int(type, 0, 0);
1125         set_array_upper_bound_int(type, 0, slen);
1126         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1127         set_type_state(type, layout_fixed);
1128
1129         ir_initializer_t *initializer = create_initializer_compound(slen);
1130         const char              *p    = literal->value.begin;
1131         for (size_t i = 0; i < slen; ++i) {
1132                 assert(p < literal->value.begin + literal->value.size);
1133                 utf32             v   = read_utf8_char(&p);
1134                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1135                 ir_initializer_t *val = create_initializer_tarval(tv);
1136                 set_initializer_compound_value(initializer, i, val);
1137         }
1138         set_entity_initializer(entity, initializer);
1139
1140         return create_symconst(dbgi, entity);
1141 }
1142
1143 /**
1144  * Creates a SymConst node representing a string constant.
1145  *
1146  * @param src_pos    the source position of the string constant
1147  * @param id_prefix  a prefix for the name of the generated string constant
1148  * @param value      the value of the string constant
1149  */
1150 static ir_node *string_to_firm(const source_position_t *const src_pos,
1151                                const char *const id_prefix,
1152                                const string_t *const value)
1153 {
1154         ir_type  *const global_type = get_glob_type();
1155         dbg_info *const dbgi        = get_dbg_info(src_pos);
1156         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1157
1158         ident     *const id     = id_unique(id_prefix);
1159         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1160         set_entity_ld_ident(entity, id);
1161         set_entity_visibility(entity, ir_visibility_private);
1162         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1163
1164         ir_type *const elem_type = ir_type_const_char;
1165         ir_mode *const mode      = get_type_mode(elem_type);
1166
1167         const char* const string = value->begin;
1168         const size_t      slen   = value->size;
1169
1170         set_array_lower_bound_int(type, 0, 0);
1171         set_array_upper_bound_int(type, 0, slen);
1172         set_type_size_bytes(type, slen);
1173         set_type_state(type, layout_fixed);
1174
1175         ir_initializer_t *initializer = create_initializer_compound(slen);
1176         for (size_t i = 0; i < slen; ++i) {
1177                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1178                 ir_initializer_t *val = create_initializer_tarval(tv);
1179                 set_initializer_compound_value(initializer, i, val);
1180         }
1181         set_entity_initializer(entity, initializer);
1182
1183         return create_symconst(dbgi, entity);
1184 }
1185
1186 static bool try_create_integer(literal_expression_t *literal,
1187                                type_t *type, unsigned char base)
1188 {
1189         const char *string = literal->value.begin;
1190         size_t      size   = literal->value.size;
1191
1192         assert(type->kind == TYPE_ATOMIC);
1193         atomic_type_kind_t akind = type->atomic.akind;
1194
1195         ir_mode   *mode = atomic_modes[akind];
1196         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1197         if (tv == tarval_bad)
1198                 return false;
1199
1200         literal->base.type    = type;
1201         literal->target_value = tv;
1202         return true;
1203 }
1204
1205 static void create_integer_tarval(literal_expression_t *literal)
1206 {
1207         unsigned        us     = 0;
1208         unsigned        ls     = 0;
1209         const string_t *suffix = &literal->suffix;
1210         /* parse suffix */
1211         if (suffix->size > 0) {
1212                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1213                         if (*c == 'u' || *c == 'U') { ++us; }
1214                         if (*c == 'l' || *c == 'L') { ++ls; }
1215                 }
1216         }
1217
1218         unsigned base;
1219         switch (literal->base.kind) {
1220                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1221                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1222                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1223                 default: panic("invalid literal kind");
1224         }
1225
1226         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1227
1228         /* now try if the constant is small enough for some types */
1229         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1230         if (ls < 1) {
1231                 if (us == 0 && try_create_integer(literal, type_int, base))
1232                         goto finished;
1233                 if ((us == 1 || base != 10)
1234                                 && try_create_integer(literal, type_unsigned_int, base))
1235                         goto finished;
1236         }
1237         if (ls < 2) {
1238                 if (us == 0 && try_create_integer(literal, type_long, base))
1239                         goto finished;
1240                 if ((us == 1 || base != 10)
1241                                 && try_create_integer(literal, type_unsigned_long, base))
1242                         goto finished;
1243         }
1244         /* last try? then we should not report tarval_bad */
1245         if (us != 1 && base == 10)
1246                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1247         if (us == 0 && try_create_integer(literal, type_long_long, base))
1248                 goto finished;
1249
1250         /* last try */
1251         assert(us == 1 || base != 10);
1252         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1253         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1254         if (!res)
1255                 panic("internal error when parsing number literal");
1256
1257 finished:
1258         tarval_set_integer_overflow_mode(old_mode);
1259 }
1260
1261 void determine_literal_type(literal_expression_t *literal)
1262 {
1263         switch (literal->base.kind) {
1264         case EXPR_LITERAL_INTEGER:
1265         case EXPR_LITERAL_INTEGER_OCTAL:
1266         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1267                 create_integer_tarval(literal);
1268                 return;
1269         default:
1270                 break;
1271         }
1272 }
1273
1274 /**
1275  * Creates a Const node representing a constant.
1276  */
1277 static ir_node *literal_to_firm(const literal_expression_t *literal)
1278 {
1279         type_t     *type   = skip_typeref(literal->base.type);
1280         ir_mode    *mode   = get_ir_mode_storage(type);
1281         const char *string = literal->value.begin;
1282         size_t      size   = literal->value.size;
1283         ir_tarval  *tv;
1284
1285         switch (literal->base.kind) {
1286         case EXPR_LITERAL_WIDE_CHARACTER: {
1287                 utf32  v = read_utf8_char(&string);
1288                 char   buf[128];
1289                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1290
1291                 tv = new_tarval_from_str(buf, len, mode);
1292                 break;
1293         }
1294
1295         case EXPR_LITERAL_CHARACTER: {
1296                 long long int v;
1297                 bool char_is_signed
1298                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1299                 if (size == 1 && char_is_signed) {
1300                         v = (signed char)string[0];
1301                 } else {
1302                         v = 0;
1303                         for (size_t i = 0; i < size; ++i) {
1304                                 v = (v << 8) | ((unsigned char)string[i]);
1305                         }
1306                 }
1307                 char   buf[128];
1308                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1309
1310                 tv = new_tarval_from_str(buf, len, mode);
1311                 break;
1312         }
1313
1314         case EXPR_LITERAL_INTEGER:
1315         case EXPR_LITERAL_INTEGER_OCTAL:
1316         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1317                 assert(literal->target_value != NULL);
1318                 tv = literal->target_value;
1319                 break;
1320
1321         case EXPR_LITERAL_FLOATINGPOINT:
1322                 tv = new_tarval_from_str(string, size, mode);
1323                 break;
1324
1325         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1326                 char buffer[size + 2];
1327                 memcpy(buffer, "0x", 2);
1328                 memcpy(buffer+2, string, size);
1329                 tv = new_tarval_from_str(buffer, size+2, mode);
1330                 break;
1331         }
1332
1333         case EXPR_LITERAL_BOOLEAN:
1334                 if (string[0] == 't') {
1335                         tv = get_mode_one(mode);
1336                 } else {
1337                         assert(string[0] == 'f');
1338         case EXPR_LITERAL_MS_NOOP:
1339                         tv = get_mode_null(mode);
1340                 }
1341                 break;
1342
1343         default:
1344                 panic("Invalid literal kind found");
1345         }
1346
1347         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1348         ir_node  *res        = new_d_Const(dbgi, tv);
1349         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1350         return create_conv(dbgi, res, mode_arith);
1351 }
1352
1353 /*
1354  * Allocate an area of size bytes aligned at alignment
1355  * at a frame type.
1356  */
1357 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1358 {
1359         static unsigned area_cnt = 0;
1360         char buf[32];
1361
1362         ir_type *tp = new_type_array(1, ir_type_char);
1363         set_array_bounds_int(tp, 0, 0, size);
1364         set_type_alignment_bytes(tp, alignment);
1365
1366         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1367         ident *name = new_id_from_str(buf);
1368         ir_entity *area = new_entity(frame_type, name, tp);
1369
1370         /* mark this entity as compiler generated */
1371         set_entity_compiler_generated(area, 1);
1372         return area;
1373 }
1374
1375 /**
1376  * Return a node representing a trampoline region
1377  * for a given function entity.
1378  *
1379  * @param dbgi    debug info
1380  * @param entity  the function entity
1381  */
1382 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1383 {
1384         ir_entity *region = NULL;
1385         int        i;
1386
1387         if (current_trampolines != NULL) {
1388                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1389                         if (current_trampolines[i].function == entity) {
1390                                 region = current_trampolines[i].region;
1391                                 break;
1392                         }
1393                 }
1394         } else {
1395                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1396         }
1397         ir_graph *irg = current_ir_graph;
1398         if (region == NULL) {
1399                 /* create a new region */
1400                 ir_type           *frame_tp = get_irg_frame_type(irg);
1401                 trampoline_region  reg;
1402                 reg.function = entity;
1403
1404                 reg.region   = alloc_trampoline(frame_tp,
1405                                                 be_params->trampoline_size,
1406                                                 be_params->trampoline_align);
1407                 ARR_APP1(trampoline_region, current_trampolines, reg);
1408                 region = reg.region;
1409         }
1410         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1411                                region);
1412 }
1413
1414 /**
1415  * Creates a trampoline for a function represented by an entity.
1416  *
1417  * @param dbgi    debug info
1418  * @param mode    the (reference) mode for the function address
1419  * @param entity  the function entity
1420  */
1421 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1422                                   ir_entity *entity)
1423 {
1424         assert(entity != NULL);
1425         ir_node *in[3];
1426         in[0] = get_trampoline_region(dbgi, entity);
1427         in[1] = create_symconst(dbgi, entity);
1428         in[2] = get_irg_frame(current_ir_graph);
1429
1430         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1431         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1432         return new_Proj(irn, mode, pn_Builtin_max+1);
1433 }
1434
1435 /**
1436  * Dereference an address.
1437  *
1438  * @param dbgi  debug info
1439  * @param type  the type of the dereferenced result (the points_to type)
1440  * @param addr  the address to dereference
1441  */
1442 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1443                                       ir_node *const addr)
1444 {
1445         type_t *skipped = skip_typeref(type);
1446         if (is_type_incomplete(skipped))
1447                 return addr;
1448
1449         ir_type *irtype = get_ir_type(skipped);
1450         if (is_compound_type(irtype)
1451             || is_Method_type(irtype)
1452             || is_Array_type(irtype)) {
1453                 return addr;
1454         }
1455
1456         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1457                                   ? cons_volatile : cons_none;
1458         ir_mode *const mode     = get_type_mode(irtype);
1459         ir_node *const memory   = get_store();
1460         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1461         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1462         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1463
1464         set_store(load_mem);
1465
1466         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1467         return create_conv(dbgi, load_res, mode_arithmetic);
1468 }
1469
1470 /**
1471  * Creates a strict Conv (to the node's mode) if necessary.
1472  *
1473  * @param dbgi  debug info
1474  * @param node  the node to strict conv
1475  */
1476 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1477 {
1478         ir_mode *mode = get_irn_mode(node);
1479
1480         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1481                 return node;
1482         if (!mode_is_float(mode))
1483                 return node;
1484
1485         /* check if there is already a Conv */
1486         if (is_Conv(node)) {
1487                 /* convert it into a strict Conv */
1488                 set_Conv_strict(node, 1);
1489                 return node;
1490         }
1491
1492         /* otherwise create a new one */
1493         return new_d_strictConv(dbgi, node, mode);
1494 }
1495
1496 /**
1497  * Returns the correct base address depending on whether it is a parameter or a
1498  * normal local variable.
1499  */
1500 static ir_node *get_local_frame(ir_entity *const ent)
1501 {
1502         ir_graph      *const irg   = current_ir_graph;
1503         const ir_type *const owner = get_entity_owner(ent);
1504         if (owner == current_outer_frame) {
1505                 assert(current_static_link != NULL);
1506                 return current_static_link;
1507         } else {
1508                 return get_irg_frame(irg);
1509         }
1510 }
1511
1512 /**
1513  * Keep all memory edges of the given block.
1514  */
1515 static void keep_all_memory(ir_node *block)
1516 {
1517         ir_node *old = get_cur_block();
1518
1519         set_cur_block(block);
1520         keep_alive(get_store());
1521         /* TODO: keep all memory edges from restricted pointers */
1522         set_cur_block(old);
1523 }
1524
1525 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1526 {
1527         entity_t *entity = ref->entity;
1528         if (entity->enum_value.tv == NULL) {
1529                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1530                 assert(type->kind == TYPE_ENUM);
1531                 determine_enum_values(&type->enumt);
1532         }
1533
1534         return new_Const(entity->enum_value.tv);
1535 }
1536
1537 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1538 {
1539         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1540         entity_t *entity = ref->entity;
1541         assert(is_declaration(entity));
1542         type_t   *type   = skip_typeref(entity->declaration.type);
1543
1544         /* make sure the type is constructed */
1545         (void) get_ir_type(type);
1546
1547         if (entity->kind == ENTITY_FUNCTION
1548             && entity->function.btk != BUILTIN_NONE) {
1549                 ir_entity *irentity = get_function_entity(entity, NULL);
1550                 /* for gcc compatibility we have to produce (dummy) addresses for some
1551                  * builtins which don't have entities */
1552                 if (irentity == NULL) {
1553                         source_position_t const *const pos = &ref->base.source_position;
1554                         symbol_t          const *const sym = ref->entity->base.symbol;
1555                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1556
1557                         /* simply create a NULL pointer */
1558                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1559                         ir_node  *res  = new_Const(get_mode_null(mode));
1560
1561                         return res;
1562                 }
1563         }
1564
1565         switch ((declaration_kind_t) entity->declaration.kind) {
1566         case DECLARATION_KIND_UNKNOWN:
1567                 break;
1568
1569         case DECLARATION_KIND_LOCAL_VARIABLE: {
1570                 ir_mode *const mode  = get_ir_mode_storage(type);
1571                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1572                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1573         }
1574         case DECLARATION_KIND_PARAMETER: {
1575                 ir_mode *const mode  = get_ir_mode_storage(type);
1576                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1577                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1578         }
1579         case DECLARATION_KIND_FUNCTION: {
1580                 return create_symconst(dbgi, entity->function.irentity);
1581         }
1582         case DECLARATION_KIND_INNER_FUNCTION: {
1583                 ir_mode *const mode = get_ir_mode_storage(type);
1584                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1585                         /* inner function not using the closure */
1586                         return create_symconst(dbgi, entity->function.irentity);
1587                 } else {
1588                         /* need trampoline here */
1589                         return create_trampoline(dbgi, mode, entity->function.irentity);
1590                 }
1591         }
1592         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1593                 const variable_t *variable = &entity->variable;
1594                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1595                 return deref_address(dbgi, variable->base.type, addr);
1596         }
1597
1598         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1599                 ir_entity *irentity = entity->variable.v.entity;
1600                 ir_node   *frame    = get_local_frame(irentity);
1601                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1602                 return deref_address(dbgi, entity->declaration.type, sel);
1603         }
1604         case DECLARATION_KIND_PARAMETER_ENTITY: {
1605                 ir_entity *irentity = entity->parameter.v.entity;
1606                 ir_node   *frame    = get_local_frame(irentity);
1607                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1608                 return deref_address(dbgi, entity->declaration.type, sel);
1609         }
1610
1611         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1612                 return entity->variable.v.vla_base;
1613
1614         case DECLARATION_KIND_COMPOUND_MEMBER:
1615                 panic("not implemented reference type");
1616         }
1617
1618         panic("reference to declaration with unknown type found");
1619 }
1620
1621 static ir_node *reference_addr(const reference_expression_t *ref)
1622 {
1623         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1624         entity_t *entity = ref->entity;
1625         assert(is_declaration(entity));
1626
1627         switch((declaration_kind_t) entity->declaration.kind) {
1628         case DECLARATION_KIND_UNKNOWN:
1629                 break;
1630         case DECLARATION_KIND_PARAMETER:
1631         case DECLARATION_KIND_LOCAL_VARIABLE:
1632                 /* you can store to a local variable (so we don't panic but return NULL
1633                  * as an indicator for no real address) */
1634                 return NULL;
1635         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1636                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1637                 return addr;
1638         }
1639         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1640                 ir_entity *irentity = entity->variable.v.entity;
1641                 ir_node   *frame    = get_local_frame(irentity);
1642                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1643
1644                 return sel;
1645         }
1646         case DECLARATION_KIND_PARAMETER_ENTITY: {
1647                 ir_entity *irentity = entity->parameter.v.entity;
1648                 ir_node   *frame    = get_local_frame(irentity);
1649                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1650
1651                 return sel;
1652         }
1653
1654         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1655                 return entity->variable.v.vla_base;
1656
1657         case DECLARATION_KIND_FUNCTION: {
1658                 return create_symconst(dbgi, entity->function.irentity);
1659         }
1660
1661         case DECLARATION_KIND_INNER_FUNCTION: {
1662                 type_t  *const type = skip_typeref(entity->declaration.type);
1663                 ir_mode *const mode = get_ir_mode_storage(type);
1664                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1665                         /* inner function not using the closure */
1666                         return create_symconst(dbgi, entity->function.irentity);
1667                 } else {
1668                         /* need trampoline here */
1669                         return create_trampoline(dbgi, mode, entity->function.irentity);
1670                 }
1671         }
1672
1673         case DECLARATION_KIND_COMPOUND_MEMBER:
1674                 panic("not implemented reference type");
1675         }
1676
1677         panic("reference to declaration with unknown type found");
1678 }
1679
1680 /**
1681  * Transform calls to builtin functions.
1682  */
1683 static ir_node *process_builtin_call(const call_expression_t *call)
1684 {
1685         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1686
1687         assert(call->function->kind == EXPR_REFERENCE);
1688         reference_expression_t *builtin = &call->function->reference;
1689
1690         type_t *expr_type = skip_typeref(builtin->base.type);
1691         assert(is_type_pointer(expr_type));
1692
1693         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1694
1695         switch (builtin->entity->function.btk) {
1696         case BUILTIN_NONE:
1697                 break;
1698         case BUILTIN_ALLOCA: {
1699                 expression_t *argument = call->arguments->expression;
1700                 ir_node      *size     = expression_to_firm(argument);
1701
1702                 ir_node *store  = get_store();
1703                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1704                                               stack_alloc);
1705                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1706                 set_store(proj_m);
1707                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1708
1709                 return res;
1710         }
1711         case BUILTIN_INF: {
1712                 type_t    *type = function_type->function.return_type;
1713                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1714                 ir_tarval *tv   = get_mode_infinite(mode);
1715                 ir_node   *res  = new_d_Const(dbgi, tv);
1716                 return res;
1717         }
1718         case BUILTIN_NAN: {
1719                 /* Ignore string for now... */
1720                 assert(is_type_function(function_type));
1721                 type_t    *type = function_type->function.return_type;
1722                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1723                 ir_tarval *tv   = get_mode_NAN(mode);
1724                 ir_node   *res  = new_d_Const(dbgi, tv);
1725                 return res;
1726         }
1727         case BUILTIN_EXPECT: {
1728                 expression_t *argument = call->arguments->expression;
1729                 return _expression_to_firm(argument);
1730         }
1731         case BUILTIN_VA_END:
1732                 /* evaluate the argument of va_end for its side effects */
1733                 _expression_to_firm(call->arguments->expression);
1734                 return NULL;
1735         case BUILTIN_OBJECT_SIZE: {
1736                 /* determine value of "type" */
1737                 expression_t *type_expression = call->arguments->next->expression;
1738                 long          type_val        = fold_constant_to_int(type_expression);
1739                 type_t       *type            = function_type->function.return_type;
1740                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1741                 /* just produce a "I don't know" result */
1742                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1743                                                 get_mode_minus_one(mode);
1744
1745                 return new_d_Const(dbgi, result);
1746         }
1747         case BUILTIN_ROTL: {
1748                 ir_node *val  = expression_to_firm(call->arguments->expression);
1749                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1750                 ir_mode *mode = get_irn_mode(val);
1751                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1752                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1753         }
1754         case BUILTIN_ROTR: {
1755                 ir_node *val  = expression_to_firm(call->arguments->expression);
1756                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1757                 ir_mode *mode = get_irn_mode(val);
1758                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1759                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1760                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1761                 return new_d_Rotl(dbgi, val, sub, mode);
1762         }
1763         case BUILTIN_FIRM:
1764                 break;
1765         case BUILTIN_LIBC:
1766         case BUILTIN_LIBC_CHECK:
1767                 panic("builtin did not produce an entity");
1768         }
1769         panic("invalid builtin found");
1770 }
1771
1772 /**
1773  * Transform a call expression.
1774  * Handles some special cases, like alloca() calls, which must be resolved
1775  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1776  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1777  * handled right...
1778  */
1779 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1780 {
1781         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1782         assert(currently_reachable());
1783
1784         expression_t   *function = call->function;
1785         ir_node        *callee   = NULL;
1786         bool            firm_builtin = false;
1787         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1788         if (function->kind == EXPR_REFERENCE) {
1789                 const reference_expression_t *ref    = &function->reference;
1790                 entity_t                     *entity = ref->entity;
1791
1792                 if (entity->kind == ENTITY_FUNCTION) {
1793                         builtin_kind_t builtin = entity->function.btk;
1794                         if (builtin == BUILTIN_FIRM) {
1795                                 firm_builtin = true;
1796                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1797                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1798                                    && builtin != BUILTIN_LIBC_CHECK) {
1799                                 return process_builtin_call(call);
1800                         }
1801                 }
1802         }
1803         if (!firm_builtin)
1804                 callee = expression_to_firm(function);
1805
1806         type_t *type = skip_typeref(function->base.type);
1807         assert(is_type_pointer(type));
1808         pointer_type_t *pointer_type = &type->pointer;
1809         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1810         assert(is_type_function(points_to));
1811         function_type_t *function_type = &points_to->function;
1812
1813         int      n_parameters    = 0;
1814         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1815         ir_type *new_method_type = NULL;
1816         if (function_type->variadic || function_type->unspecified_parameters) {
1817                 const call_argument_t *argument = call->arguments;
1818                 for ( ; argument != NULL; argument = argument->next) {
1819                         ++n_parameters;
1820                 }
1821
1822                 /* we need to construct a new method type matching the call
1823                  * arguments... */
1824                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1825                 int n_res       = get_method_n_ress(ir_method_type);
1826                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1827                 set_method_calling_convention(new_method_type,
1828                                get_method_calling_convention(ir_method_type));
1829                 set_method_additional_properties(new_method_type,
1830                                get_method_additional_properties(ir_method_type));
1831                 set_method_variadicity(new_method_type,
1832                                        get_method_variadicity(ir_method_type));
1833
1834                 for (int i = 0; i < n_res; ++i) {
1835                         set_method_res_type(new_method_type, i,
1836                                             get_method_res_type(ir_method_type, i));
1837                 }
1838                 argument = call->arguments;
1839                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1840                         expression_t *expression = argument->expression;
1841                         ir_type      *irtype     = get_ir_type(expression->base.type);
1842                         set_method_param_type(new_method_type, i, irtype);
1843                 }
1844                 ir_method_type = new_method_type;
1845         } else {
1846                 n_parameters = get_method_n_params(ir_method_type);
1847         }
1848
1849         ir_node *in[n_parameters];
1850
1851         const call_argument_t *argument = call->arguments;
1852         for (int n = 0; n < n_parameters; ++n) {
1853                 expression_t *expression = argument->expression;
1854                 ir_node      *arg_node   = expression_to_firm(expression);
1855
1856                 type_t *arg_type = skip_typeref(expression->base.type);
1857                 if (!is_type_compound(arg_type)) {
1858                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1859                         arg_node = create_conv(dbgi, arg_node, mode);
1860                         arg_node = do_strict_conv(dbgi, arg_node);
1861                 }
1862
1863                 in[n] = arg_node;
1864
1865                 argument = argument->next;
1866         }
1867
1868         ir_node *store;
1869         if (function_type->modifiers & DM_CONST) {
1870                 store = get_irg_no_mem(current_ir_graph);
1871         } else {
1872                 store = get_store();
1873         }
1874
1875         ir_node *node;
1876         type_t  *return_type = skip_typeref(function_type->return_type);
1877         ir_node *result      = NULL;
1878         if (firm_builtin) {
1879                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1880                                      ir_method_type);
1881                 if (! (function_type->modifiers & DM_CONST)) {
1882                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1883                         set_store(mem);
1884                 }
1885
1886                 if (!is_type_void(return_type)) {
1887                         assert(is_type_scalar(return_type));
1888                         ir_mode *mode = get_ir_mode_storage(return_type);
1889                         result = new_Proj(node, mode, pn_Builtin_max+1);
1890                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1891                         result              = create_conv(NULL, result, mode_arith);
1892                 }
1893         } else {
1894                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1895                 if (! (function_type->modifiers & DM_CONST)) {
1896                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1897                         set_store(mem);
1898                 }
1899
1900                 if (!is_type_void(return_type)) {
1901                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1902                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1903                         result                    = new_Proj(resproj, mode, 0);
1904                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1905                         result                    = create_conv(NULL, result, mode_arith);
1906                 }
1907         }
1908
1909         if (function_type->modifiers & DM_NORETURN) {
1910                 /* A dead end:  Keep the Call and the Block.  Also place all further
1911                  * nodes into a new and unreachable block. */
1912                 keep_alive(node);
1913                 keep_alive(get_cur_block());
1914                 ir_node *block = new_Block(0, NULL);
1915                 set_cur_block(block);
1916         }
1917
1918         return result;
1919 }
1920
1921 static ir_node *statement_to_firm(statement_t *statement);
1922 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1923
1924 static ir_node *expression_to_addr(const expression_t *expression);
1925 static ir_node *create_condition_evaluation(const expression_t *expression,
1926                                             ir_node *true_block,
1927                                             ir_node *false_block);
1928
1929 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1930                          ir_node *value)
1931 {
1932         if (!is_type_compound(type)) {
1933                 ir_mode *mode = get_ir_mode_storage(type);
1934                 value         = create_conv(dbgi, value, mode);
1935                 value         = do_strict_conv(dbgi, value);
1936         }
1937
1938         ir_node *memory = get_store();
1939
1940         if (is_type_scalar(type)) {
1941                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1942                                       ? cons_volatile : cons_none;
1943                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1944                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1945                 set_store(store_mem);
1946         } else {
1947                 ir_type *irtype    = get_ir_type(type);
1948                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1949                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1950                 set_store(copyb_mem);
1951         }
1952 }
1953
1954 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1955 {
1956         ir_tarval *all_one   = get_mode_all_one(mode);
1957         int        mode_size = get_mode_size_bits(mode);
1958         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1959
1960         assert(offset >= 0);
1961         assert(size   >= 0);
1962         assert(offset + size <= mode_size);
1963         if (size == mode_size) {
1964                 return all_one;
1965         }
1966
1967         long       shiftr    = get_mode_size_bits(mode) - size;
1968         long       shiftl    = offset;
1969         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1970         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1971         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1972         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1973
1974         return mask1;
1975 }
1976
1977 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1978                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1979                 bool need_return)
1980 {
1981         ir_type *entity_type = get_entity_type(entity);
1982         ir_type *base_type   = get_primitive_base_type(entity_type);
1983         ir_mode *mode        = get_type_mode(base_type);
1984         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1985
1986         value = create_conv(dbgi, value, mode);
1987
1988         /* kill upper bits of value and shift to right position */
1989         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1990         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1991         unsigned  base_bits  = get_mode_size_bits(mode);
1992         unsigned  shiftwidth = base_bits - bitsize;
1993
1994         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1995         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1996
1997         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1998         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1999         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2000
2001         /* load current value */
2002         ir_node   *mem             = get_store();
2003         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2004                                           set_volatile ? cons_volatile : cons_none);
2005         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2006         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2007         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2008         ir_tarval *inv_mask        = tarval_not(shift_mask);
2009         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2010         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2011
2012         /* construct new value and store */
2013         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2014         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2015                                          set_volatile ? cons_volatile : cons_none);
2016         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2017         set_store(store_mem);
2018
2019         if (!need_return)
2020                 return NULL;
2021
2022         ir_node *res_shr;
2023         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2024         if (mode_is_signed(mode)) {
2025                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2026         } else {
2027                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2028         }
2029         return res_shr;
2030 }
2031
2032 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2033                                          ir_node *addr)
2034 {
2035         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2036         entity_t *entity    = expression->compound_entry;
2037         type_t   *base_type = entity->declaration.type;
2038         ir_mode  *mode      = get_ir_mode_storage(base_type);
2039         ir_node  *mem       = get_store();
2040         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2041         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2042         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2043         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2044
2045         ir_mode  *amode     = mode;
2046         /* optimisation, since shifting in modes < machine_size is usually
2047          * less efficient */
2048         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2049                 amode = mode_uint;
2050         }
2051         unsigned amode_size = get_mode_size_bits(amode);
2052         load_res = create_conv(dbgi, load_res, amode);
2053
2054         set_store(load_mem);
2055
2056         /* kill upper bits */
2057         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2058         unsigned   bitoffset   = entity->compound_member.bit_offset;
2059         unsigned   bitsize     = entity->compound_member.bit_size;
2060         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2061         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2062         ir_node   *countl      = new_d_Const(dbgi, tvl);
2063         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2064
2065         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2066         assert(shift_bitsr <= amode_size);
2067         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2068         ir_node   *countr      = new_d_Const(dbgi, tvr);
2069         ir_node   *shiftr;
2070         if (mode_is_signed(mode)) {
2071                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2072         } else {
2073                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2074         }
2075
2076         type_t  *type    = expression->base.type;
2077         ir_mode *resmode = get_ir_mode_arithmetic(type);
2078         return create_conv(dbgi, shiftr, resmode);
2079 }
2080
2081 /* make sure the selected compound type is constructed */
2082 static void construct_select_compound(const select_expression_t *expression)
2083 {
2084         type_t *type = skip_typeref(expression->compound->base.type);
2085         if (is_type_pointer(type)) {
2086                 type = type->pointer.points_to;
2087         }
2088         (void) get_ir_type(type);
2089 }
2090
2091 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2092                                               ir_node *value, ir_node *addr)
2093 {
2094         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2095         type_t   *type = skip_typeref(expression->base.type);
2096
2097         if (!is_type_compound(type)) {
2098                 ir_mode  *mode = get_ir_mode_storage(type);
2099                 value          = create_conv(dbgi, value, mode);
2100                 value          = do_strict_conv(dbgi, value);
2101         }
2102
2103         if (expression->kind == EXPR_REFERENCE) {
2104                 const reference_expression_t *ref = &expression->reference;
2105
2106                 entity_t *entity = ref->entity;
2107                 assert(is_declaration(entity));
2108                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2109                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2110                         set_value(entity->variable.v.value_number, value);
2111                         return value;
2112                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2113                         set_value(entity->parameter.v.value_number, value);
2114                         return value;
2115                 }
2116         }
2117
2118         if (addr == NULL)
2119                 addr = expression_to_addr(expression);
2120         assert(addr != NULL);
2121
2122         if (expression->kind == EXPR_SELECT) {
2123                 const select_expression_t *select = &expression->select;
2124
2125                 construct_select_compound(select);
2126
2127                 entity_t *entity = select->compound_entry;
2128                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2129                 if (entity->compound_member.bitfield) {
2130                         ir_entity *irentity = entity->compound_member.entity;
2131                         bool       set_volatile
2132                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2133                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2134                                                        set_volatile, true);
2135                         return value;
2136                 }
2137         }
2138
2139         assign_value(dbgi, addr, type, value);
2140         return value;
2141 }
2142
2143 static void set_value_for_expression(const expression_t *expression,
2144                                      ir_node *value)
2145 {
2146         set_value_for_expression_addr(expression, value, NULL);
2147 }
2148
2149 static ir_node *get_value_from_lvalue(const expression_t *expression,
2150                                       ir_node *addr)
2151 {
2152         if (expression->kind == EXPR_REFERENCE) {
2153                 const reference_expression_t *ref = &expression->reference;
2154
2155                 entity_t *entity = ref->entity;
2156                 assert(entity->kind == ENTITY_VARIABLE
2157                                 || entity->kind == ENTITY_PARAMETER);
2158                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2159                 int value_number;
2160                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2161                         value_number = entity->variable.v.value_number;
2162                         assert(addr == NULL);
2163                         type_t  *type = skip_typeref(expression->base.type);
2164                         ir_mode *mode = get_ir_mode_storage(type);
2165                         ir_node *res  = get_value(value_number, mode);
2166                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2167                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2168                         value_number = entity->parameter.v.value_number;
2169                         assert(addr == NULL);
2170                         type_t  *type = skip_typeref(expression->base.type);
2171                         ir_mode *mode = get_ir_mode_storage(type);
2172                         ir_node *res  = get_value(value_number, mode);
2173                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2174                 }
2175         }
2176
2177         assert(addr != NULL);
2178         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2179
2180         ir_node *value;
2181         if (expression->kind == EXPR_SELECT &&
2182             expression->select.compound_entry->compound_member.bitfield) {
2183             construct_select_compound(&expression->select);
2184                 value = bitfield_extract_to_firm(&expression->select, addr);
2185         } else {
2186                 value = deref_address(dbgi, expression->base.type, addr);
2187         }
2188
2189         return value;
2190 }
2191
2192
2193 static ir_node *create_incdec(const unary_expression_t *expression)
2194 {
2195         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2196         const expression_t *value_expr = expression->value;
2197         ir_node            *addr       = expression_to_addr(value_expr);
2198         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2199
2200         type_t  *type = skip_typeref(expression->base.type);
2201         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2202
2203         ir_node *offset;
2204         if (is_type_pointer(type)) {
2205                 pointer_type_t *pointer_type = &type->pointer;
2206                 offset = get_type_size_node(pointer_type->points_to);
2207         } else {
2208                 assert(is_type_arithmetic(type));
2209                 offset = new_Const(get_mode_one(mode));
2210         }
2211
2212         ir_node *result;
2213         ir_node *store_value;
2214         switch(expression->base.kind) {
2215         case EXPR_UNARY_POSTFIX_INCREMENT:
2216                 result      = value;
2217                 store_value = new_d_Add(dbgi, value, offset, mode);
2218                 break;
2219         case EXPR_UNARY_POSTFIX_DECREMENT:
2220                 result      = value;
2221                 store_value = new_d_Sub(dbgi, value, offset, mode);
2222                 break;
2223         case EXPR_UNARY_PREFIX_INCREMENT:
2224                 result      = new_d_Add(dbgi, value, offset, mode);
2225                 store_value = result;
2226                 break;
2227         case EXPR_UNARY_PREFIX_DECREMENT:
2228                 result      = new_d_Sub(dbgi, value, offset, mode);
2229                 store_value = result;
2230                 break;
2231         default:
2232                 panic("no incdec expr in create_incdec");
2233         }
2234
2235         set_value_for_expression_addr(value_expr, store_value, addr);
2236
2237         return result;
2238 }
2239
2240 static bool is_local_variable(expression_t *expression)
2241 {
2242         if (expression->kind != EXPR_REFERENCE)
2243                 return false;
2244         reference_expression_t *ref_expr = &expression->reference;
2245         entity_t               *entity   = ref_expr->entity;
2246         if (entity->kind != ENTITY_VARIABLE)
2247                 return false;
2248         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2249         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2250 }
2251
2252 static ir_relation get_relation(const expression_kind_t kind)
2253 {
2254         switch(kind) {
2255         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2256         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2257         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2258         case EXPR_BINARY_ISLESS:
2259         case EXPR_BINARY_LESS:          return ir_relation_less;
2260         case EXPR_BINARY_ISLESSEQUAL:
2261         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2262         case EXPR_BINARY_ISGREATER:
2263         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2264         case EXPR_BINARY_ISGREATEREQUAL:
2265         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2266         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2267
2268         default:
2269                 break;
2270         }
2271         panic("trying to get pn_Cmp from non-comparison binexpr type");
2272 }
2273
2274 /**
2275  * Handle the assume optimizer hint: check if a Confirm
2276  * node can be created.
2277  *
2278  * @param dbi    debug info
2279  * @param expr   the IL assume expression
2280  *
2281  * we support here only some simple cases:
2282  *  - var rel const
2283  *  - const rel val
2284  *  - var rel var
2285  */
2286 static ir_node *handle_assume_compare(dbg_info *dbi,
2287                                       const binary_expression_t *expression)
2288 {
2289         expression_t *op1 = expression->left;
2290         expression_t *op2 = expression->right;
2291         entity_t     *var2, *var = NULL;
2292         ir_node      *res      = NULL;
2293         ir_relation   relation = get_relation(expression->base.kind);
2294
2295         if (is_local_variable(op1) && is_local_variable(op2)) {
2296                 var  = op1->reference.entity;
2297             var2 = op2->reference.entity;
2298
2299                 type_t  *const type = skip_typeref(var->declaration.type);
2300                 ir_mode *const mode = get_ir_mode_storage(type);
2301
2302                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2303                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2304
2305                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2306                 set_value(var2->variable.v.value_number, res);
2307
2308                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2309                 set_value(var->variable.v.value_number, res);
2310
2311                 return res;
2312         }
2313
2314         expression_t *con = NULL;
2315         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2316                 var = op1->reference.entity;
2317                 con = op2;
2318         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2319                 relation = get_inversed_relation(relation);
2320                 var = op2->reference.entity;
2321                 con = op1;
2322         }
2323
2324         if (var != NULL) {
2325                 type_t  *const type = skip_typeref(var->declaration.type);
2326                 ir_mode *const mode = get_ir_mode_storage(type);
2327
2328                 res = get_value(var->variable.v.value_number, mode);
2329                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2330                 set_value(var->variable.v.value_number, res);
2331         }
2332         return res;
2333 }
2334
2335 /**
2336  * Handle the assume optimizer hint.
2337  *
2338  * @param dbi    debug info
2339  * @param expr   the IL assume expression
2340  */
2341 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2342 {
2343         switch(expression->kind) {
2344         case EXPR_BINARY_EQUAL:
2345         case EXPR_BINARY_NOTEQUAL:
2346         case EXPR_BINARY_LESS:
2347         case EXPR_BINARY_LESSEQUAL:
2348         case EXPR_BINARY_GREATER:
2349         case EXPR_BINARY_GREATEREQUAL:
2350                 return handle_assume_compare(dbi, &expression->binary);
2351         default:
2352                 return NULL;
2353         }
2354 }
2355
2356 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2357                             type_t *from_type, type_t *type)
2358 {
2359         type = skip_typeref(type);
2360         if (is_type_void(type)) {
2361                 /* make sure firm type is constructed */
2362                 (void) get_ir_type(type);
2363                 return NULL;
2364         }
2365         if (!is_type_scalar(type)) {
2366                 /* make sure firm type is constructed */
2367                 (void) get_ir_type(type);
2368                 return value_node;
2369         }
2370
2371         from_type     = skip_typeref(from_type);
2372         ir_mode *mode = get_ir_mode_storage(type);
2373         /* check for conversion from / to __based types */
2374         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2375                 const variable_t *from_var = from_type->pointer.base_variable;
2376                 const variable_t *to_var   = type->pointer.base_variable;
2377                 if (from_var != to_var) {
2378                         if (from_var != NULL) {
2379                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2380                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2381                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2382                         }
2383                         if (to_var != NULL) {
2384                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2385                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2386                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2387                         }
2388                 }
2389         }
2390
2391         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2392                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2393                  * convert to mode_b so we only get a 0/1 value */
2394                 value_node = create_conv(dbgi, value_node, mode_b);
2395         }
2396
2397         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2398         ir_node *node       = create_conv(dbgi, value_node, mode);
2399         node                = do_strict_conv(dbgi, node);
2400         node                = create_conv(dbgi, node, mode_arith);
2401
2402         return node;
2403 }
2404
2405 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2406 {
2407         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2408         type_t   *type = skip_typeref(expression->base.type);
2409
2410         const expression_t *value = expression->value;
2411
2412         switch(expression->base.kind) {
2413         case EXPR_UNARY_TAKE_ADDRESS:
2414                 return expression_to_addr(value);
2415
2416         case EXPR_UNARY_NEGATE: {
2417                 ir_node *value_node = expression_to_firm(value);
2418                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2419                 return new_d_Minus(dbgi, value_node, mode);
2420         }
2421         case EXPR_UNARY_PLUS:
2422                 return expression_to_firm(value);
2423         case EXPR_UNARY_BITWISE_NEGATE: {
2424                 ir_node *value_node = expression_to_firm(value);
2425                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2426                 return new_d_Not(dbgi, value_node, mode);
2427         }
2428         case EXPR_UNARY_NOT: {
2429                 ir_node *value_node = _expression_to_firm(value);
2430                 value_node          = create_conv(dbgi, value_node, mode_b);
2431                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2432                 return res;
2433         }
2434         case EXPR_UNARY_DEREFERENCE: {
2435                 ir_node *value_node = expression_to_firm(value);
2436                 type_t  *value_type = skip_typeref(value->base.type);
2437                 assert(is_type_pointer(value_type));
2438
2439                 /* check for __based */
2440                 const variable_t *const base_var = value_type->pointer.base_variable;
2441                 if (base_var != NULL) {
2442                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2443                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2444                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2445                 }
2446                 type_t  *points_to  = value_type->pointer.points_to;
2447                 return deref_address(dbgi, points_to, value_node);
2448         }
2449         case EXPR_UNARY_POSTFIX_INCREMENT:
2450         case EXPR_UNARY_POSTFIX_DECREMENT:
2451         case EXPR_UNARY_PREFIX_INCREMENT:
2452         case EXPR_UNARY_PREFIX_DECREMENT:
2453                 return create_incdec(expression);
2454         case EXPR_UNARY_CAST: {
2455                 ir_node *value_node = expression_to_firm(value);
2456                 type_t  *from_type  = value->base.type;
2457                 return create_cast(dbgi, value_node, from_type, type);
2458         }
2459         case EXPR_UNARY_ASSUME:
2460                 return handle_assume(dbgi, value);
2461
2462         default:
2463                 break;
2464         }
2465         panic("invalid UNEXPR type found");
2466 }
2467
2468 /**
2469  * produces a 0/1 depending of the value of a mode_b node
2470  */
2471 static ir_node *produce_condition_result(const expression_t *expression,
2472                                          ir_mode *mode, dbg_info *dbgi)
2473 {
2474         ir_node *const one_block  = new_immBlock();
2475         ir_node *const zero_block = new_immBlock();
2476         create_condition_evaluation(expression, one_block, zero_block);
2477         mature_immBlock(one_block);
2478         mature_immBlock(zero_block);
2479
2480         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2481         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2482         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2483         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2484         set_cur_block(block);
2485
2486         ir_node *const one   = new_Const(get_mode_one(mode));
2487         ir_node *const zero  = new_Const(get_mode_null(mode));
2488         ir_node *const in[2] = { one, zero };
2489         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2490
2491         return val;
2492 }
2493
2494 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2495                 ir_node *value, type_t *type)
2496 {
2497         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2498         assert(is_type_pointer(type));
2499         pointer_type_t *const pointer_type = &type->pointer;
2500         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2501         ir_node        *      elem_size    = get_type_size_node(points_to);
2502         elem_size                          = create_conv(dbgi, elem_size, mode);
2503         value                              = create_conv(dbgi, value,     mode);
2504         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2505         return mul;
2506 }
2507
2508 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2509                           ir_node *left, ir_node *right)
2510 {
2511         ir_mode  *mode;
2512         type_t   *type_left  = skip_typeref(expression->left->base.type);
2513         type_t   *type_right = skip_typeref(expression->right->base.type);
2514
2515         expression_kind_t kind = expression->base.kind;
2516
2517         switch (kind) {
2518         case EXPR_BINARY_SHIFTLEFT:
2519         case EXPR_BINARY_SHIFTRIGHT:
2520         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2521         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2522                 mode  = get_ir_mode_arithmetic(expression->base.type);
2523                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2524                 break;
2525
2526         case EXPR_BINARY_SUB:
2527                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2528                         const pointer_type_t *const ptr_type = &type_left->pointer;
2529
2530                         mode = get_ir_mode_arithmetic(expression->base.type);
2531                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2532                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2533                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2534                         ir_node *const no_mem    = new_NoMem();
2535                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2536                                                                                                    mode, op_pin_state_floats);
2537                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2538                 }
2539                 /* fallthrough */
2540         case EXPR_BINARY_SUB_ASSIGN:
2541                 if (is_type_pointer(type_left)) {
2542                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2543                         mode  = get_ir_mode_arithmetic(type_left);
2544                         break;
2545                 }
2546                 goto normal_node;
2547
2548         case EXPR_BINARY_ADD:
2549         case EXPR_BINARY_ADD_ASSIGN:
2550                 if (is_type_pointer(type_left)) {
2551                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2552                         mode  = get_ir_mode_arithmetic(type_left);
2553                         break;
2554                 } else if (is_type_pointer(type_right)) {
2555                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2556                         mode  = get_ir_mode_arithmetic(type_right);
2557                         break;
2558                 }
2559                 goto normal_node;
2560
2561         default:
2562 normal_node:
2563                 mode = get_ir_mode_arithmetic(type_right);
2564                 left = create_conv(dbgi, left, mode);
2565                 break;
2566         }
2567
2568         switch (kind) {
2569         case EXPR_BINARY_ADD_ASSIGN:
2570         case EXPR_BINARY_ADD:
2571                 return new_d_Add(dbgi, left, right, mode);
2572         case EXPR_BINARY_SUB_ASSIGN:
2573         case EXPR_BINARY_SUB:
2574                 return new_d_Sub(dbgi, left, right, mode);
2575         case EXPR_BINARY_MUL_ASSIGN:
2576         case EXPR_BINARY_MUL:
2577                 return new_d_Mul(dbgi, left, right, mode);
2578         case EXPR_BINARY_BITWISE_AND:
2579         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2580                 return new_d_And(dbgi, left, right, mode);
2581         case EXPR_BINARY_BITWISE_OR:
2582         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2583                 return new_d_Or(dbgi, left, right, mode);
2584         case EXPR_BINARY_BITWISE_XOR:
2585         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2586                 return new_d_Eor(dbgi, left, right, mode);
2587         case EXPR_BINARY_SHIFTLEFT:
2588         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2589                 return new_d_Shl(dbgi, left, right, mode);
2590         case EXPR_BINARY_SHIFTRIGHT:
2591         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2592                 if (mode_is_signed(mode)) {
2593                         return new_d_Shrs(dbgi, left, right, mode);
2594                 } else {
2595                         return new_d_Shr(dbgi, left, right, mode);
2596                 }
2597         case EXPR_BINARY_DIV:
2598         case EXPR_BINARY_DIV_ASSIGN: {
2599                 ir_node *pin = new_Pin(new_NoMem());
2600                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2601                                          op_pin_state_floats);
2602                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2603                 return res;
2604         }
2605         case EXPR_BINARY_MOD:
2606         case EXPR_BINARY_MOD_ASSIGN: {
2607                 ir_node *pin = new_Pin(new_NoMem());
2608                 assert(!mode_is_float(mode));
2609                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2610                                          op_pin_state_floats);
2611                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2612                 return res;
2613         }
2614         default:
2615                 panic("unexpected expression kind");
2616         }
2617 }
2618
2619 static ir_node *create_lazy_op(const binary_expression_t *expression)
2620 {
2621         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2622         type_t   *type = skip_typeref(expression->base.type);
2623         ir_mode  *mode = get_ir_mode_arithmetic(type);
2624
2625         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2626                 bool val = fold_constant_to_bool(expression->left);
2627                 expression_kind_t ekind = expression->base.kind;
2628                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2629                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2630                         if (!val) {
2631                                 return new_Const(get_mode_null(mode));
2632                         }
2633                 } else {
2634                         if (val) {
2635                                 return new_Const(get_mode_one(mode));
2636                         }
2637                 }
2638
2639                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2640                         bool valr = fold_constant_to_bool(expression->right);
2641                         return create_Const_from_bool(mode, valr);
2642                 }
2643
2644                 return produce_condition_result(expression->right, mode, dbgi);
2645         }
2646
2647         return produce_condition_result((const expression_t*) expression, mode,
2648                                         dbgi);
2649 }
2650
2651 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2652                                             ir_node *right, ir_mode *mode);
2653
2654 static ir_node *create_assign_binop(const binary_expression_t *expression)
2655 {
2656         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2657         const expression_t *left_expr = expression->left;
2658         type_t             *type      = skip_typeref(left_expr->base.type);
2659         ir_node            *right     = expression_to_firm(expression->right);
2660         ir_node            *left_addr = expression_to_addr(left_expr);
2661         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2662         ir_node            *result    = create_op(dbgi, expression, left, right);
2663
2664         result = create_cast(dbgi, result, expression->right->base.type, type);
2665         result = do_strict_conv(dbgi, result);
2666
2667         result = set_value_for_expression_addr(left_expr, result, left_addr);
2668
2669         if (!is_type_compound(type)) {
2670                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2671                 result = create_conv(dbgi, result, mode_arithmetic);
2672         }
2673         return result;
2674 }
2675
2676 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2677 {
2678         expression_kind_t kind = expression->base.kind;
2679
2680         switch(kind) {
2681         case EXPR_BINARY_EQUAL:
2682         case EXPR_BINARY_NOTEQUAL:
2683         case EXPR_BINARY_LESS:
2684         case EXPR_BINARY_LESSEQUAL:
2685         case EXPR_BINARY_GREATER:
2686         case EXPR_BINARY_GREATEREQUAL:
2687         case EXPR_BINARY_ISGREATER:
2688         case EXPR_BINARY_ISGREATEREQUAL:
2689         case EXPR_BINARY_ISLESS:
2690         case EXPR_BINARY_ISLESSEQUAL:
2691         case EXPR_BINARY_ISLESSGREATER:
2692         case EXPR_BINARY_ISUNORDERED: {
2693                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2694                 ir_node    *left     = expression_to_firm(expression->left);
2695                 ir_node    *right    = expression_to_firm(expression->right);
2696                 ir_relation relation = get_relation(kind);
2697                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2698                 return cmp;
2699         }
2700         case EXPR_BINARY_ASSIGN: {
2701                 ir_node *addr  = expression_to_addr(expression->left);
2702                 ir_node *right = expression_to_firm(expression->right);
2703                 ir_node *res
2704                         = set_value_for_expression_addr(expression->left, right, addr);
2705
2706                 type_t  *type            = skip_typeref(expression->base.type);
2707                 if (!is_type_compound(type)) {
2708                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2709                         res                      = create_conv(NULL, res, mode_arithmetic);
2710                 }
2711                 return res;
2712         }
2713         case EXPR_BINARY_ADD:
2714         case EXPR_BINARY_SUB:
2715         case EXPR_BINARY_MUL:
2716         case EXPR_BINARY_DIV:
2717         case EXPR_BINARY_MOD:
2718         case EXPR_BINARY_BITWISE_AND:
2719         case EXPR_BINARY_BITWISE_OR:
2720         case EXPR_BINARY_BITWISE_XOR:
2721         case EXPR_BINARY_SHIFTLEFT:
2722         case EXPR_BINARY_SHIFTRIGHT:
2723         {
2724                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2725                 ir_node  *left  = expression_to_firm(expression->left);
2726                 ir_node  *right = expression_to_firm(expression->right);
2727                 return create_op(dbgi, expression, left, right);
2728         }
2729         case EXPR_BINARY_LOGICAL_AND:
2730         case EXPR_BINARY_LOGICAL_OR:
2731                 return create_lazy_op(expression);
2732         case EXPR_BINARY_COMMA:
2733                 /* create side effects of left side */
2734                 (void) expression_to_firm(expression->left);
2735                 return _expression_to_firm(expression->right);
2736
2737         case EXPR_BINARY_ADD_ASSIGN:
2738         case EXPR_BINARY_SUB_ASSIGN:
2739         case EXPR_BINARY_MUL_ASSIGN:
2740         case EXPR_BINARY_MOD_ASSIGN:
2741         case EXPR_BINARY_DIV_ASSIGN:
2742         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2743         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2744         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2745         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2746         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2747                 return create_assign_binop(expression);
2748         default:
2749                 panic("TODO binexpr type");
2750         }
2751 }
2752
2753 static ir_node *array_access_addr(const array_access_expression_t *expression)
2754 {
2755         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2756         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2757         ir_node  *offset      = expression_to_firm(expression->index);
2758         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2759         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2760         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2761
2762         return result;
2763 }
2764
2765 static ir_node *array_access_to_firm(
2766                 const array_access_expression_t *expression)
2767 {
2768         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2769         ir_node  *addr   = array_access_addr(expression);
2770         type_t   *type   = revert_automatic_type_conversion(
2771                         (const expression_t*) expression);
2772         type             = skip_typeref(type);
2773
2774         return deref_address(dbgi, type, addr);
2775 }
2776
2777 static long get_offsetof_offset(const offsetof_expression_t *expression)
2778 {
2779         type_t *orig_type = expression->type;
2780         long    offset    = 0;
2781
2782         designator_t *designator = expression->designator;
2783         for ( ; designator != NULL; designator = designator->next) {
2784                 type_t *type = skip_typeref(orig_type);
2785                 /* be sure the type is constructed */
2786                 (void) get_ir_type(type);
2787
2788                 if (designator->symbol != NULL) {
2789                         assert(is_type_compound(type));
2790                         symbol_t *symbol = designator->symbol;
2791
2792                         compound_t *compound = type->compound.compound;
2793                         entity_t   *iter     = compound->members.entities;
2794                         for ( ; iter != NULL; iter = iter->base.next) {
2795                                 if (iter->base.symbol == symbol) {
2796                                         break;
2797                                 }
2798                         }
2799                         assert(iter != NULL);
2800
2801                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2802                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2803                         offset += get_entity_offset(iter->compound_member.entity);
2804
2805                         orig_type = iter->declaration.type;
2806                 } else {
2807                         expression_t *array_index = designator->array_index;
2808                         assert(designator->array_index != NULL);
2809                         assert(is_type_array(type));
2810
2811                         long index         = fold_constant_to_int(array_index);
2812                         ir_type *arr_type  = get_ir_type(type);
2813                         ir_type *elem_type = get_array_element_type(arr_type);
2814                         long     elem_size = get_type_size_bytes(elem_type);
2815
2816                         offset += index * elem_size;
2817
2818                         orig_type = type->array.element_type;
2819                 }
2820         }
2821
2822         return offset;
2823 }
2824
2825 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2826 {
2827         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2828         long       offset = get_offsetof_offset(expression);
2829         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2830         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2831
2832         return new_d_Const(dbgi, tv);
2833 }
2834
2835 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2836                                      ir_entity *entity, type_t *type);
2837 static ir_initializer_t *create_ir_initializer(
2838                 const initializer_t *initializer, type_t *type);
2839
2840 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2841                                             initializer_t *initializer,
2842                                             type_t *type)
2843 {
2844         /* create the ir_initializer */
2845         ir_graph *const old_current_ir_graph = current_ir_graph;
2846         current_ir_graph = get_const_code_irg();
2847
2848         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2849
2850         assert(current_ir_graph == get_const_code_irg());
2851         current_ir_graph = old_current_ir_graph;
2852
2853         ident     *const id          = id_unique("initializer.%u");
2854         ir_type   *const irtype      = get_ir_type(type);
2855         ir_type   *const global_type = get_glob_type();
2856         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2857         set_entity_ld_ident(entity, id);
2858         set_entity_visibility(entity, ir_visibility_private);
2859         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2860         set_entity_initializer(entity, irinitializer);
2861         return entity;
2862 }
2863
2864 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2865 {
2866         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2867         type_t        *type        = expression->type;
2868         initializer_t *initializer = expression->initializer;
2869
2870         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2871                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2872                 return create_symconst(dbgi, entity);
2873         } else {
2874                 /* create an entity on the stack */
2875                 ident   *const id     = id_unique("CompLit.%u");
2876                 ir_type *const irtype = get_ir_type(type);
2877                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2878
2879                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2880                 set_entity_ld_ident(entity, id);
2881
2882                 /* create initialisation code */
2883                 create_local_initializer(initializer, dbgi, entity, type);
2884
2885                 /* create a sel for the compound literal address */
2886                 ir_node *frame = get_irg_frame(current_ir_graph);
2887                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2888                 return sel;
2889         }
2890 }
2891
2892 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2893 {
2894         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2895         type_t   *const type = expr->type;
2896         ir_node  *const addr = compound_literal_addr(expr);
2897         return deref_address(dbgi, type, addr);
2898 }
2899
2900 /**
2901  * Transform a sizeof expression into Firm code.
2902  */
2903 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2904 {
2905         type_t *const type = skip_typeref(expression->type);
2906         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2907         if (is_type_array(type) && type->array.is_vla
2908                         && expression->tp_expression != NULL) {
2909                 expression_to_firm(expression->tp_expression);
2910         }
2911
2912         return get_type_size_node(type);
2913 }
2914
2915 static entity_t *get_expression_entity(const expression_t *expression)
2916 {
2917         if (expression->kind != EXPR_REFERENCE)
2918                 return NULL;
2919
2920         return expression->reference.entity;
2921 }
2922
2923 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2924 {
2925         switch(entity->kind) {
2926         case DECLARATION_KIND_CASES:
2927                 return entity->declaration.alignment;
2928         case ENTITY_STRUCT:
2929         case ENTITY_UNION:
2930                 return entity->compound.alignment;
2931         case ENTITY_TYPEDEF:
2932                 return entity->typedefe.alignment;
2933         default:
2934                 break;
2935         }
2936         return 0;
2937 }
2938
2939 /**
2940  * Transform an alignof expression into Firm code.
2941  */
2942 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2943 {
2944         unsigned alignment = 0;
2945
2946         const expression_t *tp_expression = expression->tp_expression;
2947         if (tp_expression != NULL) {
2948                 entity_t *entity = get_expression_entity(tp_expression);
2949                 if (entity != NULL) {
2950                         if (entity->kind == ENTITY_FUNCTION) {
2951                                 /* a gnu-extension */
2952                                 alignment = 1;
2953                         } else {
2954                                 alignment = get_cparser_entity_alignment(entity);
2955                         }
2956                 }
2957         }
2958
2959         if (alignment == 0) {
2960                 type_t *type = expression->type;
2961                 alignment = get_type_alignment(type);
2962         }
2963
2964         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2965         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2966         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2967         return new_d_Const(dbgi, tv);
2968 }
2969
2970 static void init_ir_types(void);
2971
2972 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2973 {
2974         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2975
2976         bool constant_folding_old = constant_folding;
2977         constant_folding = true;
2978         int old_optimize         = get_optimize();
2979         int old_constant_folding = get_opt_constant_folding();
2980         set_optimize(1);
2981         set_opt_constant_folding(1);
2982
2983         init_ir_types();
2984
2985         ir_graph *old_current_ir_graph = current_ir_graph;
2986         current_ir_graph = get_const_code_irg();
2987
2988         ir_node *const cnst = _expression_to_firm(expression);
2989
2990         current_ir_graph = old_current_ir_graph;
2991         set_optimize(old_optimize);
2992         set_opt_constant_folding(old_constant_folding);
2993
2994         if (!is_Const(cnst)) {
2995                 panic("couldn't fold constant");
2996         }
2997
2998         constant_folding = constant_folding_old;
2999
3000         ir_tarval *const tv   = get_Const_tarval(cnst);
3001         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
3002         return tarval_convert_to(tv, mode);
3003 }
3004
3005 /* this function is only used in parser.c, but it relies on libfirm functionality */
3006 bool constant_is_negative(const expression_t *expression)
3007 {
3008         ir_tarval *tv = fold_constant_to_tarval(expression);
3009         return tarval_is_negative(tv);
3010 }
3011
3012 long fold_constant_to_int(const expression_t *expression)
3013 {
3014         ir_tarval *tv = fold_constant_to_tarval(expression);
3015         if (!tarval_is_long(tv)) {
3016                 panic("result of constant folding is not integer");
3017         }
3018
3019         return get_tarval_long(tv);
3020 }
3021
3022 bool fold_constant_to_bool(const expression_t *expression)
3023 {
3024         ir_tarval *tv = fold_constant_to_tarval(expression);
3025         return !tarval_is_null(tv);
3026 }
3027
3028 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3029 {
3030         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3031
3032         /* first try to fold a constant condition */
3033         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3034                 bool val = fold_constant_to_bool(expression->condition);
3035                 if (val) {
3036                         expression_t *true_expression = expression->true_expression;
3037                         if (true_expression == NULL)
3038                                 true_expression = expression->condition;
3039                         return expression_to_firm(true_expression);
3040                 } else {
3041                         return expression_to_firm(expression->false_expression);
3042                 }
3043         }
3044
3045         ir_node *const true_block  = new_immBlock();
3046         ir_node *const false_block = new_immBlock();
3047         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3048         mature_immBlock(true_block);
3049         mature_immBlock(false_block);
3050
3051         set_cur_block(true_block);
3052         ir_node *true_val;
3053         if (expression->true_expression != NULL) {
3054                 true_val = expression_to_firm(expression->true_expression);
3055         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3056                 true_val = cond_expr;
3057         } else {
3058                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3059                  * comparison.  Generate a "1" as value for the true branch. */
3060                 true_val = new_Const(get_mode_one(mode_Is));
3061         }
3062         ir_node *const true_jmp = new_d_Jmp(dbgi);
3063
3064         set_cur_block(false_block);
3065         ir_node *const false_val = expression_to_firm(expression->false_expression);
3066         ir_node *const false_jmp = new_d_Jmp(dbgi);
3067
3068         /* create the common block */
3069         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3070         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3071         set_cur_block(block);
3072
3073         /* TODO improve static semantics, so either both or no values are NULL */
3074         if (true_val == NULL || false_val == NULL)
3075                 return NULL;
3076
3077         ir_node *const in[2] = { true_val, false_val };
3078         type_t  *const type  = skip_typeref(expression->base.type);
3079         ir_mode *const mode  = get_ir_mode_arithmetic(type);
3080         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3081
3082         return val;
3083 }
3084
3085 /**
3086  * Returns an IR-node representing the address of a field.
3087  */
3088 static ir_node *select_addr(const select_expression_t *expression)
3089 {
3090         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3091
3092         construct_select_compound(expression);
3093
3094         ir_node *compound_addr = expression_to_firm(expression->compound);
3095
3096         entity_t *entry = expression->compound_entry;
3097         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3098         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3099
3100         if (constant_folding) {
3101                 ir_mode *mode      = get_irn_mode(compound_addr);
3102                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3103                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3104                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3105         } else {
3106                 ir_entity *irentity = entry->compound_member.entity;
3107                 assert(irentity != NULL);
3108                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3109         }
3110 }
3111
3112 static ir_node *select_to_firm(const select_expression_t *expression)
3113 {
3114         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3115         ir_node  *addr = select_addr(expression);
3116         type_t   *type = revert_automatic_type_conversion(
3117                         (const expression_t*) expression);
3118         type           = skip_typeref(type);
3119
3120         entity_t *entry = expression->compound_entry;
3121         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3122
3123         if (entry->compound_member.bitfield) {
3124                 return bitfield_extract_to_firm(expression, addr);
3125         }
3126
3127         return deref_address(dbgi, type, addr);
3128 }
3129
3130 /* Values returned by __builtin_classify_type. */
3131 typedef enum gcc_type_class
3132 {
3133         no_type_class = -1,
3134         void_type_class,
3135         integer_type_class,
3136         char_type_class,
3137         enumeral_type_class,
3138         boolean_type_class,
3139         pointer_type_class,
3140         reference_type_class,
3141         offset_type_class,
3142         real_type_class,
3143         complex_type_class,
3144         function_type_class,
3145         method_type_class,
3146         record_type_class,
3147         union_type_class,
3148         array_type_class,
3149         string_type_class,
3150         set_type_class,
3151         file_type_class,
3152         lang_type_class
3153 } gcc_type_class;
3154
3155 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3156 {
3157         type_t *type = expr->type_expression->base.type;
3158
3159         /* FIXME gcc returns different values depending on whether compiling C or C++
3160          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3161         gcc_type_class tc;
3162         for (;;) {
3163                 type = skip_typeref(type);
3164                 switch (type->kind) {
3165                         case TYPE_ATOMIC: {
3166                                 const atomic_type_t *const atomic_type = &type->atomic;
3167                                 switch (atomic_type->akind) {
3168                                         /* should not be reached */
3169                                         case ATOMIC_TYPE_INVALID:
3170                                                 tc = no_type_class;
3171                                                 goto make_const;
3172
3173                                         /* gcc cannot do that */
3174                                         case ATOMIC_TYPE_VOID:
3175                                                 tc = void_type_class;
3176                                                 goto make_const;
3177
3178                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3179                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3180                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3181                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3182                                         case ATOMIC_TYPE_SHORT:
3183                                         case ATOMIC_TYPE_USHORT:
3184                                         case ATOMIC_TYPE_INT:
3185                                         case ATOMIC_TYPE_UINT:
3186                                         case ATOMIC_TYPE_LONG:
3187                                         case ATOMIC_TYPE_ULONG:
3188                                         case ATOMIC_TYPE_LONGLONG:
3189                                         case ATOMIC_TYPE_ULONGLONG:
3190                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3191                                                 tc = integer_type_class;
3192                                                 goto make_const;
3193
3194                                         case ATOMIC_TYPE_FLOAT:
3195                                         case ATOMIC_TYPE_DOUBLE:
3196                                         case ATOMIC_TYPE_LONG_DOUBLE:
3197                                                 tc = real_type_class;
3198                                                 goto make_const;
3199                                 }
3200                                 panic("Unexpected atomic type in classify_type_to_firm().");
3201                         }
3202
3203                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3204                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3205                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3206                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3207                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3208                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3209                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3210
3211                         /* gcc handles this as integer */
3212                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3213
3214                         /* gcc classifies the referenced type */
3215                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3216
3217                         /* typedef/typeof should be skipped already */
3218                         case TYPE_TYPEDEF:
3219                         case TYPE_TYPEOF:
3220                         case TYPE_ERROR:
3221                                 break;
3222                 }
3223                 panic("unexpected TYPE classify_type_to_firm().");
3224         }
3225
3226 make_const:;
3227         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3228         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3229         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3230         return new_d_Const(dbgi, tv);
3231 }
3232
3233 static ir_node *function_name_to_firm(
3234                 const funcname_expression_t *const expr)
3235 {
3236         switch(expr->kind) {
3237         case FUNCNAME_FUNCTION:
3238         case FUNCNAME_PRETTY_FUNCTION:
3239         case FUNCNAME_FUNCDNAME:
3240                 if (current_function_name == NULL) {
3241                         const source_position_t *const src_pos = &expr->base.source_position;
3242                         const char    *name  = current_function_entity->base.symbol->string;
3243                         const string_t string = { name, strlen(name) + 1 };
3244                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3245                 }
3246                 return current_function_name;
3247         case FUNCNAME_FUNCSIG:
3248                 if (current_funcsig == NULL) {
3249                         const source_position_t *const src_pos = &expr->base.source_position;
3250                         ir_entity *ent = get_irg_entity(current_ir_graph);
3251                         const char *const name = get_entity_ld_name(ent);
3252                         const string_t string = { name, strlen(name) + 1 };
3253                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3254                 }
3255                 return current_funcsig;
3256         }
3257         panic("Unsupported function name");
3258 }
3259
3260 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3261 {
3262         statement_t *statement = expr->statement;
3263
3264         assert(statement->kind == STATEMENT_COMPOUND);
3265         return compound_statement_to_firm(&statement->compound);
3266 }
3267
3268 static ir_node *va_start_expression_to_firm(
3269         const va_start_expression_t *const expr)
3270 {
3271         ir_entity *param_ent = current_vararg_entity;
3272         if (param_ent == NULL) {
3273                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3274                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3275                 ir_type *const param_type  = get_unknown_type();
3276                 param_ent = new_parameter_entity(frame_type, n, param_type);
3277                 current_vararg_entity = param_ent;
3278         }
3279
3280         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3281         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3282         ir_node  *const no_mem  = new_NoMem();
3283         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3284
3285         set_value_for_expression(expr->ap, arg_sel);
3286
3287         return NULL;
3288 }
3289
3290 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3291 {
3292         type_t       *const type    = expr->base.type;
3293         expression_t *const ap_expr = expr->ap;
3294         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3295         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3296         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3297         ir_node      *const res     = deref_address(dbgi, type, ap);
3298
3299         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3300         ir_mode      *const mode    = get_irn_mode(cnst);
3301         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3302         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3303         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3304         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3305         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3306
3307         set_value_for_expression_addr(ap_expr, add, ap_addr);
3308
3309         return res;
3310 }
3311
3312 /**
3313  * Generate Firm for a va_copy expression.
3314  */
3315 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3316 {
3317         ir_node *const src = expression_to_firm(expr->src);
3318         set_value_for_expression(expr->dst, src);
3319         return NULL;
3320 }
3321
3322 static ir_node *dereference_addr(const unary_expression_t *const expression)
3323 {
3324         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3325         return expression_to_firm(expression->value);
3326 }
3327
3328 /**
3329  * Returns a IR-node representing an lvalue of the given expression.
3330  */
3331 static ir_node *expression_to_addr(const expression_t *expression)
3332 {
3333         switch(expression->kind) {
3334         case EXPR_ARRAY_ACCESS:
3335                 return array_access_addr(&expression->array_access);
3336         case EXPR_CALL:
3337                 return call_expression_to_firm(&expression->call);
3338         case EXPR_COMPOUND_LITERAL:
3339                 return compound_literal_addr(&expression->compound_literal);
3340         case EXPR_REFERENCE:
3341                 return reference_addr(&expression->reference);
3342         case EXPR_SELECT:
3343                 return select_addr(&expression->select);
3344         case EXPR_UNARY_DEREFERENCE:
3345                 return dereference_addr(&expression->unary);
3346         default:
3347                 break;
3348         }
3349         panic("trying to get address of non-lvalue");
3350 }
3351
3352 static ir_node *builtin_constant_to_firm(
3353                 const builtin_constant_expression_t *expression)
3354 {
3355         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3356         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3357         return create_Const_from_bool(mode, v);
3358 }
3359
3360 static ir_node *builtin_types_compatible_to_firm(
3361                 const builtin_types_compatible_expression_t *expression)
3362 {
3363         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3364         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3365         bool     const value = types_compatible(left, right);
3366         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3367         return create_Const_from_bool(mode, value);
3368 }
3369
3370 static ir_node *get_label_block(label_t *label)
3371 {
3372         if (label->block != NULL)
3373                 return label->block;
3374
3375         /* beware: might be called from create initializer with current_ir_graph
3376          * set to const_code_irg. */
3377         ir_graph *rem    = current_ir_graph;
3378         current_ir_graph = current_function;
3379
3380         ir_node *block = new_immBlock();
3381
3382         label->block = block;
3383
3384         ARR_APP1(label_t *, all_labels, label);
3385
3386         current_ir_graph = rem;
3387         return block;
3388 }
3389
3390 /**
3391  * Pointer to a label.  This is used for the
3392  * GNU address-of-label extension.
3393  */
3394 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3395 {
3396         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3397         ir_node   *block  = get_label_block(label->label);
3398         ir_entity *entity = create_Block_entity(block);
3399
3400         symconst_symbol value;
3401         value.entity_p = entity;
3402         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3403 }
3404
3405 /**
3406  * creates firm nodes for an expression. The difference between this function
3407  * and expression_to_firm is, that this version might produce mode_b nodes
3408  * instead of mode_Is.
3409  */
3410 static ir_node *_expression_to_firm(expression_t const *const expr)
3411 {
3412 #ifndef NDEBUG
3413         if (!constant_folding) {
3414                 assert(!expr->base.transformed);
3415                 ((expression_t*)expr)->base.transformed = true;
3416         }
3417 #endif
3418
3419         switch (expr->kind) {
3420         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3421         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3422         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3423         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3424         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3425         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3426         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3427         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3428         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3429         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3430         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3431         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3432         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3433         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3434         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3435         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3436         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3437         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3438         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3439         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3440         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3441         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3442         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3443
3444         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->literal.value);
3445
3446         case EXPR_ERROR: break;
3447         }
3448         panic("invalid expression found");
3449 }
3450
3451 /**
3452  * Check if a given expression is a GNU __builtin_expect() call.
3453  */
3454 static bool is_builtin_expect(const expression_t *expression)
3455 {
3456         if (expression->kind != EXPR_CALL)
3457                 return false;
3458
3459         expression_t *function = expression->call.function;
3460         if (function->kind != EXPR_REFERENCE)
3461                 return false;
3462         reference_expression_t *ref = &function->reference;
3463         if (ref->entity->kind         != ENTITY_FUNCTION ||
3464             ref->entity->function.btk != BUILTIN_EXPECT)
3465                 return false;
3466
3467         return true;
3468 }
3469
3470 static bool produces_mode_b(const expression_t *expression)
3471 {
3472         switch (expression->kind) {
3473         case EXPR_BINARY_EQUAL:
3474         case EXPR_BINARY_NOTEQUAL:
3475         case EXPR_BINARY_LESS:
3476         case EXPR_BINARY_LESSEQUAL:
3477         case EXPR_BINARY_GREATER:
3478         case EXPR_BINARY_GREATEREQUAL:
3479         case EXPR_BINARY_ISGREATER:
3480         case EXPR_BINARY_ISGREATEREQUAL:
3481         case EXPR_BINARY_ISLESS:
3482         case EXPR_BINARY_ISLESSEQUAL:
3483         case EXPR_BINARY_ISLESSGREATER:
3484         case EXPR_BINARY_ISUNORDERED:
3485         case EXPR_UNARY_NOT:
3486                 return true;
3487
3488         case EXPR_CALL:
3489                 if (is_builtin_expect(expression)) {
3490                         expression_t *argument = expression->call.arguments->expression;
3491                         return produces_mode_b(argument);
3492                 }
3493                 return false;
3494         case EXPR_BINARY_COMMA:
3495                 return produces_mode_b(expression->binary.right);
3496
3497         default:
3498                 return false;
3499         }
3500 }
3501
3502 static ir_node *expression_to_firm(const expression_t *expression)
3503 {
3504         if (!produces_mode_b(expression)) {
3505                 ir_node *res = _expression_to_firm(expression);
3506                 assert(res == NULL || get_irn_mode(res) != mode_b);
3507                 return res;
3508         }
3509
3510         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3511                 return new_Const(fold_constant_to_tarval(expression));
3512         }
3513
3514         /* we have to produce a 0/1 from the mode_b expression */
3515         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3516         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3517         return produce_condition_result(expression, mode, dbgi);
3518 }
3519
3520 /**
3521  * create a short-circuit expression evaluation that tries to construct
3522  * efficient control flow structures for &&, || and ! expressions
3523  */
3524 static ir_node *create_condition_evaluation(const expression_t *expression,
3525                                             ir_node *true_block,
3526                                             ir_node *false_block)
3527 {
3528         switch(expression->kind) {
3529         case EXPR_UNARY_NOT: {
3530                 const unary_expression_t *unary_expression = &expression->unary;
3531                 create_condition_evaluation(unary_expression->value, false_block,
3532                                             true_block);
3533                 return NULL;
3534         }
3535         case EXPR_BINARY_LOGICAL_AND: {
3536                 const binary_expression_t *binary_expression = &expression->binary;
3537
3538                 ir_node *extra_block = new_immBlock();
3539                 create_condition_evaluation(binary_expression->left, extra_block,
3540                                             false_block);
3541                 mature_immBlock(extra_block);
3542                 set_cur_block(extra_block);
3543                 create_condition_evaluation(binary_expression->right, true_block,
3544                                             false_block);
3545                 return NULL;
3546         }
3547         case EXPR_BINARY_LOGICAL_OR: {
3548                 const binary_expression_t *binary_expression = &expression->binary;
3549
3550                 ir_node *extra_block = new_immBlock();
3551                 create_condition_evaluation(binary_expression->left, true_block,
3552                                             extra_block);
3553                 mature_immBlock(extra_block);
3554                 set_cur_block(extra_block);
3555                 create_condition_evaluation(binary_expression->right, true_block,
3556                                             false_block);
3557                 return NULL;
3558         }
3559         default:
3560                 break;
3561         }
3562
3563         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3564         ir_node  *cond_expr  = _expression_to_firm(expression);
3565         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3566         ir_node  *cond       = new_d_Cond(dbgi, condition);
3567         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3568         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3569
3570         /* set branch prediction info based on __builtin_expect */
3571         if (is_builtin_expect(expression) && is_Cond(cond)) {
3572                 call_argument_t *argument = expression->call.arguments->next;
3573                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3574                         bool               const cnst = fold_constant_to_bool(argument->expression);
3575                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3576                         set_Cond_jmp_pred(cond, pred);
3577                 }
3578         }
3579
3580         add_immBlock_pred(true_block, true_proj);
3581         add_immBlock_pred(false_block, false_proj);
3582
3583         set_unreachable_now();
3584         return cond_expr;
3585 }
3586
3587 static void create_variable_entity(entity_t *variable,
3588                                    declaration_kind_t declaration_kind,
3589                                    ir_type *parent_type)
3590 {
3591         assert(variable->kind == ENTITY_VARIABLE);
3592         type_t    *type = skip_typeref(variable->declaration.type);
3593
3594         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3595         ir_type   *const irtype    = get_ir_type(type);
3596         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3597         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3598         unsigned         alignment = variable->declaration.alignment;
3599
3600         set_entity_alignment(irentity, alignment);
3601
3602         handle_decl_modifiers(irentity, variable);
3603
3604         variable->declaration.kind  = (unsigned char) declaration_kind;
3605         variable->variable.v.entity = irentity;
3606         set_entity_ld_ident(irentity, create_ld_ident(variable));
3607
3608         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3609                 set_entity_volatility(irentity, volatility_is_volatile);
3610         }
3611 }
3612
3613
3614 typedef struct type_path_entry_t type_path_entry_t;
3615 struct type_path_entry_t {
3616         type_t           *type;
3617         ir_initializer_t *initializer;
3618         size_t            index;
3619         entity_t         *compound_entry;
3620 };
3621
3622 typedef struct type_path_t type_path_t;
3623 struct type_path_t {
3624         type_path_entry_t *path;
3625         type_t            *top_type;
3626         bool               invalid;
3627 };
3628
3629 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3630 {
3631         size_t len = ARR_LEN(path->path);
3632
3633         for (size_t i = 0; i < len; ++i) {
3634                 const type_path_entry_t *entry = & path->path[i];
3635
3636                 type_t *type = skip_typeref(entry->type);
3637                 if (is_type_compound(type)) {
3638                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3639                 } else if (is_type_array(type)) {
3640                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3641                 } else {
3642                         fprintf(stderr, "-INVALID-");
3643                 }
3644         }
3645         fprintf(stderr, "  (");
3646         print_type(path->top_type);
3647         fprintf(stderr, ")");
3648 }
3649
3650 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3651 {
3652         size_t len = ARR_LEN(path->path);
3653         assert(len > 0);
3654         return & path->path[len-1];
3655 }
3656
3657 static type_path_entry_t *append_to_type_path(type_path_t *path)
3658 {
3659         size_t len = ARR_LEN(path->path);
3660         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3661
3662         type_path_entry_t *result = & path->path[len];
3663         memset(result, 0, sizeof(result[0]));
3664         return result;
3665 }
3666
3667 static size_t get_compound_member_count(const compound_type_t *type)
3668 {
3669         compound_t *compound  = type->compound;
3670         size_t      n_members = 0;
3671         entity_t   *member    = compound->members.entities;
3672         for ( ; member != NULL; member = member->base.next) {
3673                 ++n_members;
3674         }
3675
3676         return n_members;
3677 }
3678
3679 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3680 {
3681         type_t *orig_top_type = path->top_type;
3682         type_t *top_type      = skip_typeref(orig_top_type);
3683
3684         assert(is_type_compound(top_type) || is_type_array(top_type));
3685
3686         if (ARR_LEN(path->path) == 0) {
3687                 return NULL;
3688         } else {
3689                 type_path_entry_t *top         = get_type_path_top(path);
3690                 ir_initializer_t  *initializer = top->initializer;
3691                 return get_initializer_compound_value(initializer, top->index);
3692         }
3693 }
3694
3695 static void descend_into_subtype(type_path_t *path)
3696 {
3697         type_t *orig_top_type = path->top_type;
3698         type_t *top_type      = skip_typeref(orig_top_type);
3699
3700         assert(is_type_compound(top_type) || is_type_array(top_type));
3701
3702         ir_initializer_t *initializer = get_initializer_entry(path);
3703
3704         type_path_entry_t *top = append_to_type_path(path);
3705         top->type              = top_type;
3706
3707         size_t len;
3708
3709         if (is_type_compound(top_type)) {
3710                 compound_t *const compound = top_type->compound.compound;
3711                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3712
3713                 top->compound_entry = entry;
3714                 top->index          = 0;
3715                 len                 = get_compound_member_count(&top_type->compound);
3716                 if (entry != NULL) {
3717                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3718                         path->top_type = entry->declaration.type;
3719                 }
3720         } else {
3721                 assert(is_type_array(top_type));
3722                 assert(top_type->array.size > 0);
3723
3724                 top->index     = 0;
3725                 path->top_type = top_type->array.element_type;
3726                 len            = top_type->array.size;
3727         }
3728         if (initializer == NULL
3729                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3730                 initializer = create_initializer_compound(len);
3731                 /* we have to set the entry at the 2nd latest path entry... */
3732                 size_t path_len = ARR_LEN(path->path);
3733                 assert(path_len >= 1);
3734                 if (path_len > 1) {
3735                         type_path_entry_t *entry        = & path->path[path_len-2];
3736                         ir_initializer_t  *tinitializer = entry->initializer;
3737                         set_initializer_compound_value(tinitializer, entry->index,
3738                                                        initializer);
3739                 }
3740         }
3741         top->initializer = initializer;
3742 }
3743
3744 static void ascend_from_subtype(type_path_t *path)
3745 {
3746         type_path_entry_t *top = get_type_path_top(path);
3747
3748         path->top_type = top->type;
3749
3750         size_t len = ARR_LEN(path->path);
3751         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3752 }
3753
3754 static void walk_designator(type_path_t *path, const designator_t *designator)
3755 {
3756         /* designators start at current object type */
3757         ARR_RESIZE(type_path_entry_t, path->path, 1);
3758
3759         for ( ; designator != NULL; designator = designator->next) {
3760                 type_path_entry_t *top         = get_type_path_top(path);
3761                 type_t            *orig_type   = top->type;
3762                 type_t            *type        = skip_typeref(orig_type);
3763
3764                 if (designator->symbol != NULL) {
3765                         assert(is_type_compound(type));
3766                         size_t    index  = 0;
3767                         symbol_t *symbol = designator->symbol;
3768
3769                         compound_t *compound = type->compound.compound;
3770                         entity_t   *iter     = compound->members.entities;
3771                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3772                                 if (iter->base.symbol == symbol) {
3773                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3774                                         break;
3775                                 }
3776                         }
3777                         assert(iter != NULL);
3778
3779                         /* revert previous initialisations of other union elements */
3780                         if (type->kind == TYPE_COMPOUND_UNION) {
3781                                 ir_initializer_t *initializer = top->initializer;
3782                                 if (initializer != NULL
3783                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3784                                         /* are we writing to a new element? */
3785                                         ir_initializer_t *oldi
3786                                                 = get_initializer_compound_value(initializer, index);
3787                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3788                                                 /* clear initializer */
3789                                                 size_t len
3790                                                         = get_initializer_compound_n_entries(initializer);
3791                                                 ir_initializer_t *nulli = get_initializer_null();
3792                                                 for (size_t i = 0; i < len; ++i) {
3793                                                         set_initializer_compound_value(initializer, i,
3794                                                                                        nulli);
3795                                                 }
3796                                         }
3797                                 }
3798                         }
3799
3800                         top->type           = orig_type;
3801                         top->compound_entry = iter;
3802                         top->index          = index;
3803                         orig_type           = iter->declaration.type;
3804                 } else {
3805                         expression_t *array_index = designator->array_index;
3806                         assert(designator->array_index != NULL);
3807                         assert(is_type_array(type));
3808
3809                         long index = fold_constant_to_int(array_index);
3810                         assert(index >= 0);
3811 #ifndef NDEBUG
3812                         if (type->array.size_constant) {
3813                                 long array_size = type->array.size;
3814                                 assert(index < array_size);
3815                         }
3816 #endif
3817
3818                         top->type  = orig_type;
3819                         top->index = (size_t) index;
3820                         orig_type  = type->array.element_type;
3821                 }
3822                 path->top_type = orig_type;
3823
3824                 if (designator->next != NULL) {
3825                         descend_into_subtype(path);
3826                 }
3827         }
3828
3829         path->invalid  = false;
3830 }
3831
3832 static void advance_current_object(type_path_t *path)
3833 {
3834         if (path->invalid) {
3835                 /* TODO: handle this... */
3836                 panic("invalid initializer in ast2firm (excessive elements)");
3837         }
3838
3839         type_path_entry_t *top = get_type_path_top(path);
3840
3841         type_t *type = skip_typeref(top->type);
3842         if (is_type_union(type)) {
3843                 /* only the first element is initialized in unions */
3844                 top->compound_entry = NULL;
3845         } else if (is_type_struct(type)) {
3846                 entity_t *entry = top->compound_entry;
3847
3848                 top->index++;
3849                 entry               = skip_unnamed_bitfields(entry->base.next);
3850                 top->compound_entry = entry;
3851                 if (entry != NULL) {
3852                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3853                         path->top_type = entry->declaration.type;
3854                         return;
3855                 }
3856         } else {
3857                 assert(is_type_array(type));
3858
3859                 top->index++;
3860                 if (!type->array.size_constant || top->index < type->array.size) {
3861                         return;
3862                 }
3863         }
3864
3865         /* we're past the last member of the current sub-aggregate, try if we
3866          * can ascend in the type hierarchy and continue with another subobject */
3867         size_t len = ARR_LEN(path->path);
3868
3869         if (len > 1) {
3870                 ascend_from_subtype(path);
3871                 advance_current_object(path);
3872         } else {
3873                 path->invalid = true;
3874         }
3875 }
3876
3877
3878 static ir_initializer_t *create_ir_initializer_value(
3879                 const initializer_value_t *initializer)
3880 {
3881         if (is_type_compound(initializer->value->base.type)) {
3882                 panic("initializer creation for compounds not implemented yet");
3883         }
3884         type_t       *type = initializer->value->base.type;
3885         expression_t *expr = initializer->value;
3886         ir_node *value = expression_to_firm(expr);
3887         ir_mode *mode  = get_ir_mode_storage(type);
3888         value          = create_conv(NULL, value, mode);
3889         return create_initializer_const(value);
3890 }
3891
3892 /** test wether type can be initialized by a string constant */
3893 static bool is_string_type(type_t *type)
3894 {
3895         type_t *inner;
3896         if (is_type_pointer(type)) {
3897                 inner = skip_typeref(type->pointer.points_to);
3898         } else if(is_type_array(type)) {
3899                 inner = skip_typeref(type->array.element_type);
3900         } else {
3901                 return false;
3902         }
3903
3904         return is_type_integer(inner);
3905 }
3906
3907 static ir_initializer_t *create_ir_initializer_list(
3908                 const initializer_list_t *initializer, type_t *type)
3909 {
3910         type_path_t path;
3911         memset(&path, 0, sizeof(path));
3912         path.top_type = type;
3913         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3914
3915         descend_into_subtype(&path);
3916
3917         for (size_t i = 0; i < initializer->len; ++i) {
3918                 const initializer_t *sub_initializer = initializer->initializers[i];
3919
3920                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3921                         walk_designator(&path, sub_initializer->designator.designator);
3922                         continue;
3923                 }
3924
3925                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3926                         /* we might have to descend into types until we're at a scalar
3927                          * type */
3928                         while(true) {
3929                                 type_t *orig_top_type = path.top_type;
3930                                 type_t *top_type      = skip_typeref(orig_top_type);
3931
3932                                 if (is_type_scalar(top_type))
3933                                         break;
3934                                 descend_into_subtype(&path);
3935                         }
3936                 } else if (sub_initializer->kind == INITIALIZER_STRING
3937                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3938                         /* we might have to descend into types until we're at a scalar
3939                          * type */
3940                         while (true) {
3941                                 type_t *orig_top_type = path.top_type;
3942                                 type_t *top_type      = skip_typeref(orig_top_type);
3943
3944                                 if (is_string_type(top_type))
3945                                         break;
3946                                 descend_into_subtype(&path);
3947                         }
3948                 }
3949
3950                 ir_initializer_t *sub_irinitializer
3951                         = create_ir_initializer(sub_initializer, path.top_type);
3952
3953                 size_t path_len = ARR_LEN(path.path);
3954                 assert(path_len >= 1);
3955                 type_path_entry_t *entry        = & path.path[path_len-1];
3956                 ir_initializer_t  *tinitializer = entry->initializer;
3957                 set_initializer_compound_value(tinitializer, entry->index,
3958                                                sub_irinitializer);
3959
3960                 advance_current_object(&path);
3961         }
3962
3963         assert(ARR_LEN(path.path) >= 1);
3964         ir_initializer_t *result = path.path[0].initializer;
3965         DEL_ARR_F(path.path);
3966
3967         return result;
3968 }
3969
3970 static ir_initializer_t *create_ir_initializer_string(
3971                 const initializer_string_t *initializer, type_t *type)
3972 {
3973         type = skip_typeref(type);
3974
3975         size_t            string_len    = initializer->string.size;
3976         assert(type->kind == TYPE_ARRAY);
3977         assert(type->array.size_constant);
3978         size_t            len           = type->array.size;
3979         ir_initializer_t *irinitializer = create_initializer_compound(len);
3980
3981         const char *string = initializer->string.begin;
3982         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3983
3984         for (size_t i = 0; i < len; ++i) {
3985                 char c = 0;
3986                 if (i < string_len)
3987                         c = string[i];
3988
3989                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3990                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3991
3992                 set_initializer_compound_value(irinitializer, i, char_initializer);
3993         }
3994
3995         return irinitializer;
3996 }
3997
3998 static ir_initializer_t *create_ir_initializer_wide_string(
3999                 const initializer_wide_string_t *initializer, type_t *type)
4000 {
4001         assert(type->kind == TYPE_ARRAY);
4002         assert(type->array.size_constant);
4003         size_t            len           = type->array.size;
4004         size_t            string_len    = wstrlen(&initializer->string);
4005         ir_initializer_t *irinitializer = create_initializer_compound(len);
4006
4007         const char *p    = initializer->string.begin;
4008         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4009
4010         for (size_t i = 0; i < len; ++i) {
4011                 utf32 c = 0;
4012                 if (i < string_len) {
4013                         c = read_utf8_char(&p);
4014                 }
4015                 ir_tarval *tv = new_tarval_from_long(c, mode);
4016                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4017
4018                 set_initializer_compound_value(irinitializer, i, char_initializer);
4019         }
4020
4021         return irinitializer;
4022 }
4023
4024 static ir_initializer_t *create_ir_initializer(
4025                 const initializer_t *initializer, type_t *type)
4026 {
4027         switch(initializer->kind) {
4028                 case INITIALIZER_STRING:
4029                         return create_ir_initializer_string(&initializer->string, type);
4030
4031                 case INITIALIZER_WIDE_STRING:
4032                         return create_ir_initializer_wide_string(&initializer->wide_string,
4033                                                                  type);
4034
4035                 case INITIALIZER_LIST:
4036                         return create_ir_initializer_list(&initializer->list, type);
4037
4038                 case INITIALIZER_VALUE:
4039                         return create_ir_initializer_value(&initializer->value);
4040
4041                 case INITIALIZER_DESIGNATOR:
4042                         panic("unexpected designator initializer found");
4043         }
4044         panic("unknown initializer");
4045 }
4046
4047 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4048  *  are elements [...] the remainder of the aggregate shall be initialized
4049  *  implicitly the same as objects that have static storage duration. */
4050 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4051                 ir_node *base_addr)
4052 {
4053         /* for unions we must NOT do anything for null initializers */
4054         ir_type *owner = get_entity_owner(entity);
4055         if (is_Union_type(owner)) {
4056                 return;
4057         }
4058
4059         ir_type *ent_type = get_entity_type(entity);
4060         /* create sub-initializers for a compound type */
4061         if (is_compound_type(ent_type)) {
4062                 unsigned n_members = get_compound_n_members(ent_type);
4063                 for (unsigned n = 0; n < n_members; ++n) {
4064                         ir_entity *member = get_compound_member(ent_type, n);
4065                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4066                                                                 member);
4067                         create_dynamic_null_initializer(member, dbgi, addr);
4068                 }
4069                 return;
4070         }
4071         if (is_Array_type(ent_type)) {
4072                 assert(has_array_upper_bound(ent_type, 0));
4073                 long n = get_array_upper_bound_int(ent_type, 0);
4074                 for (long i = 0; i < n; ++i) {
4075                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4076                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4077                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4078                         ir_node   *in[1]    = { cnst };
4079                         ir_entity *arrent   = get_array_element_entity(ent_type);
4080                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4081                                                         arrent);
4082                         create_dynamic_null_initializer(arrent, dbgi, addr);
4083                 }
4084                 return;
4085         }
4086
4087         ir_mode *value_mode = get_type_mode(ent_type);
4088         ir_node *node       = new_Const(get_mode_null(value_mode));
4089
4090         /* is it a bitfield type? */
4091         if (is_Primitive_type(ent_type) &&
4092                         get_primitive_base_type(ent_type) != NULL) {
4093                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4094                 return;
4095         }
4096
4097         ir_node *mem    = get_store();
4098         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4099         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4100         set_store(proj_m);
4101 }
4102
4103 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4104                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4105 {
4106         switch(get_initializer_kind(initializer)) {
4107         case IR_INITIALIZER_NULL:
4108                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4109                 return;
4110         case IR_INITIALIZER_CONST: {
4111                 ir_node *node     = get_initializer_const_value(initializer);
4112                 ir_type *ent_type = get_entity_type(entity);
4113
4114                 /* is it a bitfield type? */
4115                 if (is_Primitive_type(ent_type) &&
4116                                 get_primitive_base_type(ent_type) != NULL) {
4117                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4118                         return;
4119                 }
4120
4121                 assert(get_type_mode(type) == get_irn_mode(node));
4122                 ir_node *mem    = get_store();
4123                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4124                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4125                 set_store(proj_m);
4126                 return;
4127         }
4128         case IR_INITIALIZER_TARVAL: {
4129                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4130                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4131                 ir_type   *ent_type = get_entity_type(entity);
4132
4133                 /* is it a bitfield type? */
4134                 if (is_Primitive_type(ent_type) &&
4135                                 get_primitive_base_type(ent_type) != NULL) {
4136                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4137                         return;
4138                 }
4139
4140                 assert(get_type_mode(type) == get_tarval_mode(tv));
4141                 ir_node *mem    = get_store();
4142                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4143                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4144                 set_store(proj_m);
4145                 return;
4146         }
4147         case IR_INITIALIZER_COMPOUND: {
4148                 assert(is_compound_type(type) || is_Array_type(type));
4149                 int n_members;
4150                 if (is_Array_type(type)) {
4151                         assert(has_array_upper_bound(type, 0));
4152                         n_members = get_array_upper_bound_int(type, 0);
4153                 } else {
4154                         n_members = get_compound_n_members(type);
4155                 }
4156
4157                 if (get_initializer_compound_n_entries(initializer)
4158                                 != (unsigned) n_members)
4159                         panic("initializer doesn't match compound type");
4160
4161                 for (int i = 0; i < n_members; ++i) {
4162                         ir_node   *addr;
4163                         ir_type   *irtype;
4164                         ir_entity *sub_entity;
4165                         if (is_Array_type(type)) {
4166                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4167                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4168                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4169                                 ir_node   *in[1]    = { cnst };
4170                                 irtype     = get_array_element_type(type);
4171                                 sub_entity = get_array_element_entity(type);
4172                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4173                                                        sub_entity);
4174                         } else {
4175                                 sub_entity = get_compound_member(type, i);
4176                                 irtype     = get_entity_type(sub_entity);
4177                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4178                                                              sub_entity);
4179                         }
4180
4181                         ir_initializer_t *sub_init
4182                                 = get_initializer_compound_value(initializer, i);
4183
4184                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4185                                                        addr);
4186                 }
4187                 return;
4188         }
4189         }
4190
4191         panic("invalid IR_INITIALIZER found");
4192 }
4193
4194 static void create_dynamic_initializer(ir_initializer_t *initializer,
4195                 dbg_info *dbgi, ir_entity *entity)
4196 {
4197         ir_node *frame     = get_irg_frame(current_ir_graph);
4198         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4199         ir_type *type      = get_entity_type(entity);
4200
4201         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4202 }
4203
4204 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4205                                      ir_entity *entity, type_t *type)
4206 {
4207         ir_node *memory = get_store();
4208         ir_node *nomem  = new_NoMem();
4209         ir_node *frame  = get_irg_frame(current_ir_graph);
4210         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4211
4212         if (initializer->kind == INITIALIZER_VALUE) {
4213                 initializer_value_t *initializer_value = &initializer->value;
4214
4215                 ir_node *value = expression_to_firm(initializer_value->value);
4216                 type = skip_typeref(type);
4217                 assign_value(dbgi, addr, type, value);
4218                 return;
4219         }
4220
4221         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4222                 ir_initializer_t *irinitializer
4223                         = create_ir_initializer(initializer, type);
4224
4225                 create_dynamic_initializer(irinitializer, dbgi, entity);
4226                 return;
4227         }
4228
4229         /* create a "template" entity which is copied to the entity on the stack */
4230         ir_entity *const init_entity
4231                 = create_initializer_entity(dbgi, initializer, type);
4232         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4233         ir_type *const irtype   = get_ir_type(type);
4234         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4235
4236         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4237         set_store(copyb_mem);
4238 }
4239
4240 static void create_initializer_local_variable_entity(entity_t *entity)
4241 {
4242         assert(entity->kind == ENTITY_VARIABLE);
4243         initializer_t *initializer = entity->variable.initializer;
4244         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4245         ir_entity     *irentity    = entity->variable.v.entity;
4246         type_t        *type        = entity->declaration.type;
4247
4248         create_local_initializer(initializer, dbgi, irentity, type);
4249 }
4250
4251 static void create_variable_initializer(entity_t *entity)
4252 {
4253         assert(entity->kind == ENTITY_VARIABLE);
4254         initializer_t *initializer = entity->variable.initializer;
4255         if (initializer == NULL)
4256                 return;
4257
4258         declaration_kind_t declaration_kind
4259                 = (declaration_kind_t) entity->declaration.kind;
4260         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4261                 create_initializer_local_variable_entity(entity);
4262                 return;
4263         }
4264
4265         type_t            *type = entity->declaration.type;
4266         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4267
4268         if (initializer->kind == INITIALIZER_VALUE) {
4269                 expression_t *      value     = initializer->value.value;
4270                 type_t       *const init_type = skip_typeref(value->base.type);
4271
4272                 if (!is_type_scalar(init_type)) {
4273                         /* skip convs */
4274                         while (value->kind == EXPR_UNARY_CAST)
4275                                 value = value->unary.value;
4276
4277                         if (value->kind != EXPR_COMPOUND_LITERAL)
4278                                 panic("expected non-scalar initializer to be a compound literal");
4279                         initializer = value->compound_literal.initializer;
4280                         goto have_initializer;
4281                 }
4282
4283                 ir_node  *      node = expression_to_firm(value);
4284                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4285                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4286                 node = create_conv(dbgi, node, mode);
4287                 node = do_strict_conv(dbgi, node);
4288
4289                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4290                         set_value(entity->variable.v.value_number, node);
4291                 } else {
4292                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4293
4294                         ir_entity *irentity = entity->variable.v.entity;
4295
4296                         if (tq & TYPE_QUALIFIER_CONST
4297                                         && get_entity_owner(irentity) != get_tls_type()) {
4298                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4299                         }
4300                         set_atomic_ent_value(irentity, node);
4301                 }
4302         } else {
4303 have_initializer:
4304                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4305                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4306
4307                 ir_entity        *irentity        = entity->variable.v.entity;
4308                 ir_initializer_t *irinitializer
4309                         = create_ir_initializer(initializer, type);
4310
4311                 if (tq & TYPE_QUALIFIER_CONST) {
4312                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4313                 }
4314                 set_entity_initializer(irentity, irinitializer);
4315         }
4316 }
4317
4318 static void create_variable_length_array(entity_t *entity)
4319 {
4320         assert(entity->kind == ENTITY_VARIABLE);
4321         assert(entity->variable.initializer == NULL);
4322
4323         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4324         entity->variable.v.vla_base = NULL;
4325
4326         /* TODO: record VLA somewhere so we create the free node when we leave
4327          * it's scope */
4328 }
4329
4330 static void allocate_variable_length_array(entity_t *entity)
4331 {
4332         assert(entity->kind == ENTITY_VARIABLE);
4333         assert(entity->variable.initializer == NULL);
4334         assert(currently_reachable());
4335
4336         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4337         type_t   *type      = entity->declaration.type;
4338         ir_type  *el_type   = get_ir_type(type->array.element_type);
4339
4340         /* make sure size_node is calculated */
4341         get_type_size_node(type);
4342         ir_node  *elems = type->array.size_node;
4343         ir_node  *mem   = get_store();
4344         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4345
4346         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4347         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4348         set_store(proj_m);
4349
4350         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4351         entity->variable.v.vla_base = addr;
4352 }
4353
4354 /**
4355  * Creates a Firm local variable from a declaration.
4356  */
4357 static void create_local_variable(entity_t *entity)
4358 {
4359         assert(entity->kind == ENTITY_VARIABLE);
4360         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4361
4362         bool needs_entity = entity->variable.address_taken;
4363         type_t *type = skip_typeref(entity->declaration.type);
4364
4365         /* is it a variable length array? */
4366         if (is_type_array(type) && !type->array.size_constant) {
4367                 create_variable_length_array(entity);
4368                 return;
4369         } else if (is_type_array(type) || is_type_compound(type)) {
4370                 needs_entity = true;
4371         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4372                 needs_entity = true;
4373         }
4374
4375         if (needs_entity) {
4376                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4377                 create_variable_entity(entity,
4378                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4379                                        frame_type);
4380         } else {
4381                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4382                 entity->variable.v.value_number = next_value_number_function;
4383                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4384                                         entity);
4385                 ++next_value_number_function;
4386         }
4387 }
4388
4389 static void create_local_static_variable(entity_t *entity)
4390 {
4391         assert(entity->kind == ENTITY_VARIABLE);
4392         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4393
4394         type_t   *type           = skip_typeref(entity->declaration.type);
4395         ir_type  *const var_type = entity->variable.thread_local ?
4396                 get_tls_type() : get_glob_type();
4397         ir_type  *const irtype   = get_ir_type(type);
4398         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4399
4400         size_t l = strlen(entity->base.symbol->string);
4401         char   buf[l + sizeof(".%u")];
4402         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4403         ident     *const id       = id_unique(buf);
4404         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4405
4406         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4407                 set_entity_volatility(irentity, volatility_is_volatile);
4408         }
4409
4410         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4411         entity->variable.v.entity = irentity;
4412
4413         set_entity_ld_ident(irentity, id);
4414         set_entity_visibility(irentity, ir_visibility_local);
4415
4416         ir_graph *const old_current_ir_graph = current_ir_graph;
4417         current_ir_graph = get_const_code_irg();
4418
4419         create_variable_initializer(entity);
4420
4421         assert(current_ir_graph == get_const_code_irg());
4422         current_ir_graph = old_current_ir_graph;
4423 }
4424
4425
4426
4427 static ir_node *return_statement_to_firm(return_statement_t *statement)
4428 {
4429         if (!currently_reachable())
4430                 return NULL;
4431
4432         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4433         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4434         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4435
4436         int in_len;
4437         if (!is_type_void(type)) {
4438                 ir_mode *const mode = get_ir_mode_storage(type);
4439                 if (res) {
4440                         res = create_conv(dbgi, res, mode);
4441                         res = do_strict_conv(dbgi, res);
4442                 } else {
4443                         res = new_Unknown(mode);
4444                 }
4445                 in_len = 1;
4446         } else {
4447                 in_len = 0;
4448         }
4449
4450         ir_node *const in[1] = { res };
4451         ir_node *const store = get_store();
4452         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4453
4454         ir_node *end_block = get_irg_end_block(current_ir_graph);
4455         add_immBlock_pred(end_block, ret);
4456
4457         set_unreachable_now();
4458         return NULL;
4459 }
4460
4461 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4462 {
4463         if (!currently_reachable())
4464                 return NULL;
4465
4466         return expression_to_firm(statement->expression);
4467 }
4468
4469 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4470 {
4471         entity_t *entity = compound->scope.entities;
4472         for ( ; entity != NULL; entity = entity->base.next) {
4473                 if (!is_declaration(entity))
4474                         continue;
4475
4476                 create_local_declaration(entity);
4477         }
4478
4479         ir_node     *result    = NULL;
4480         statement_t *statement = compound->statements;
4481         for ( ; statement != NULL; statement = statement->base.next) {
4482                 result = statement_to_firm(statement);
4483         }
4484
4485         return result;
4486 }
4487
4488 static void create_global_variable(entity_t *entity)
4489 {
4490         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4491         ir_visibility visibility = ir_visibility_default;
4492         ir_entity    *irentity;
4493         assert(entity->kind == ENTITY_VARIABLE);
4494
4495         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4496         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4497         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4498         case STORAGE_CLASS_NONE:
4499                 visibility = ir_visibility_default;
4500                 /* uninitialized globals get merged in C */
4501                 if (entity->variable.initializer == NULL)
4502                         linkage |= IR_LINKAGE_MERGE;
4503                 break;
4504         case STORAGE_CLASS_TYPEDEF:
4505         case STORAGE_CLASS_AUTO:
4506         case STORAGE_CLASS_REGISTER:
4507                 panic("invalid storage class for global var");
4508         }
4509
4510         ir_type *var_type = get_glob_type();
4511         if (entity->variable.thread_local) {
4512                 var_type = get_tls_type();
4513                 /* LINKAGE_MERGE not supported by current linkers */
4514                 linkage &= ~IR_LINKAGE_MERGE;
4515         }
4516         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4517         irentity = entity->variable.v.entity;
4518         add_entity_linkage(irentity, linkage);
4519         set_entity_visibility(irentity, visibility);
4520 }
4521
4522 static void create_local_declaration(entity_t *entity)
4523 {
4524         assert(is_declaration(entity));
4525
4526         /* construct type */
4527         (void) get_ir_type(entity->declaration.type);
4528         if (entity->base.symbol == NULL) {
4529                 return;
4530         }
4531
4532         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4533         case STORAGE_CLASS_STATIC:
4534                 if (entity->kind == ENTITY_FUNCTION) {
4535                         (void)get_function_entity(entity, NULL);
4536                 } else {
4537                         create_local_static_variable(entity);
4538                 }
4539                 return;
4540         case STORAGE_CLASS_EXTERN:
4541                 if (entity->kind == ENTITY_FUNCTION) {
4542                         assert(entity->function.statement == NULL);
4543                         (void)get_function_entity(entity, NULL);
4544                 } else {
4545                         create_global_variable(entity);
4546                         create_variable_initializer(entity);
4547                 }
4548                 return;
4549         case STORAGE_CLASS_NONE:
4550         case STORAGE_CLASS_AUTO:
4551         case STORAGE_CLASS_REGISTER:
4552                 if (entity->kind == ENTITY_FUNCTION) {
4553                         if (entity->function.statement != NULL) {
4554                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4555                                 (void)get_function_entity(entity, owner);
4556                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4557                                 enqueue_inner_function(entity);
4558                         } else {
4559                                 (void)get_function_entity(entity, NULL);
4560                         }
4561                 } else {
4562                         create_local_variable(entity);
4563                 }
4564                 return;
4565         case STORAGE_CLASS_TYPEDEF:
4566                 break;
4567         }
4568         panic("invalid storage class found");
4569 }
4570
4571 static void initialize_local_declaration(entity_t *entity)
4572 {
4573         if (entity->base.symbol == NULL)
4574                 return;
4575
4576         // no need to emit code in dead blocks
4577         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4578                         && !currently_reachable())
4579                 return;
4580
4581         switch ((declaration_kind_t) entity->declaration.kind) {
4582         case DECLARATION_KIND_LOCAL_VARIABLE:
4583         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4584                 create_variable_initializer(entity);
4585                 return;
4586
4587         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4588                 allocate_variable_length_array(entity);
4589                 return;
4590
4591         case DECLARATION_KIND_COMPOUND_MEMBER:
4592         case DECLARATION_KIND_GLOBAL_VARIABLE:
4593         case DECLARATION_KIND_FUNCTION:
4594         case DECLARATION_KIND_INNER_FUNCTION:
4595                 return;
4596
4597         case DECLARATION_KIND_PARAMETER:
4598         case DECLARATION_KIND_PARAMETER_ENTITY:
4599                 panic("can't initialize parameters");
4600
4601         case DECLARATION_KIND_UNKNOWN:
4602                 panic("can't initialize unknown declaration");
4603         }
4604         panic("invalid declaration kind");
4605 }
4606
4607 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4608 {
4609         entity_t *entity = statement->declarations_begin;
4610         if (entity == NULL)
4611                 return NULL;
4612
4613         entity_t *const last = statement->declarations_end;
4614         for ( ;; entity = entity->base.next) {
4615                 if (is_declaration(entity)) {
4616                         initialize_local_declaration(entity);
4617                 } else if (entity->kind == ENTITY_TYPEDEF) {
4618                         /* §6.7.7:3  Any array size expressions associated with variable length
4619                          * array declarators are evaluated each time the declaration of the
4620                          * typedef name is reached in the order of execution. */
4621                         type_t *const type = skip_typeref(entity->typedefe.type);
4622                         if (is_type_array(type) && type->array.is_vla)
4623                                 get_vla_size(&type->array);
4624                 }
4625                 if (entity == last)
4626                         break;
4627         }
4628
4629         return NULL;
4630 }
4631
4632 static ir_node *if_statement_to_firm(if_statement_t *statement)
4633 {
4634         /* Create the condition. */
4635         ir_node *true_block  = NULL;
4636         ir_node *false_block = NULL;
4637         if (currently_reachable()) {
4638                 true_block  = new_immBlock();
4639                 false_block = new_immBlock();
4640                 create_condition_evaluation(statement->condition, true_block, false_block);
4641                 mature_immBlock(true_block);
4642                 mature_immBlock(false_block);
4643         }
4644
4645         /* Create the true statement. */
4646         set_cur_block(true_block);
4647         statement_to_firm(statement->true_statement);
4648         ir_node *fallthrough_block = get_cur_block();
4649
4650         /* Create the false statement. */
4651         set_cur_block(false_block);
4652         if (statement->false_statement != NULL) {
4653                 statement_to_firm(statement->false_statement);
4654         }
4655
4656         /* Handle the block after the if-statement.  Minor simplification and
4657          * optimisation: Reuse the false/true block as fallthrough block, if the
4658          * true/false statement does not pass control to the fallthrough block, e.g.
4659          * in the typical if (x) return; pattern. */
4660         if (fallthrough_block) {
4661                 if (currently_reachable()) {
4662                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4663                         ir_node *const f_jump = new_Jmp();
4664                         ir_node *const in[]   = { t_jump, f_jump };
4665                         fallthrough_block = new_Block(2, in);
4666                 }
4667                 set_cur_block(fallthrough_block);
4668         }
4669
4670         return NULL;
4671 }
4672
4673 /**
4674  * Add an unconditional jump to the target block.  If the source block is not
4675  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4676  * loops.  This is necessary if the jump potentially enters a loop.
4677  */
4678 static void jump_to(ir_node *const target_block)
4679 {
4680         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4681         add_immBlock_pred(target_block, pred);
4682 }
4683
4684 /**
4685  * Add an unconditional jump to the target block, if the current block is
4686  * reachable and do nothing otherwise.  This is only valid if the jump does not
4687  * enter a loop (a back edge is ok).
4688  */
4689 static void jump_if_reachable(ir_node *const target_block)
4690 {
4691         if (currently_reachable())
4692                 add_immBlock_pred(target_block, new_Jmp());
4693 }
4694
4695 static ir_node *while_statement_to_firm(while_statement_t *statement)
4696 {
4697         /* Create the header block */
4698         ir_node *const header_block = new_immBlock();
4699         jump_to(header_block);
4700
4701         /* Create the condition. */
4702         ir_node      *      body_block;
4703         ir_node      *      false_block;
4704         expression_t *const cond = statement->condition;
4705         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4706                         fold_constant_to_bool(cond)) {
4707                 /* Shortcut for while (true). */
4708                 body_block  = header_block;
4709                 false_block = NULL;
4710
4711                 keep_alive(header_block);
4712                 keep_all_memory(header_block);
4713         } else {
4714                 body_block  = new_immBlock();
4715                 false_block = new_immBlock();
4716
4717                 set_cur_block(header_block);
4718                 create_condition_evaluation(cond, body_block, false_block);
4719                 mature_immBlock(body_block);
4720         }
4721
4722         ir_node *const old_continue_label = continue_label;
4723         ir_node *const old_break_label    = break_label;
4724         continue_label = header_block;
4725         break_label    = false_block;
4726
4727         /* Create the loop body. */
4728         set_cur_block(body_block);
4729         statement_to_firm(statement->body);
4730         jump_if_reachable(header_block);
4731
4732         mature_immBlock(header_block);
4733         assert(false_block == NULL || false_block == break_label);
4734         false_block = break_label;
4735         if (false_block != NULL) {
4736                 mature_immBlock(false_block);
4737         }
4738         set_cur_block(false_block);
4739
4740         assert(continue_label == header_block);
4741         continue_label = old_continue_label;
4742         break_label    = old_break_label;
4743         return NULL;
4744 }
4745
4746 static ir_node *get_break_label(void)
4747 {
4748         if (break_label == NULL) {
4749                 break_label = new_immBlock();
4750         }
4751         return break_label;
4752 }
4753
4754 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4755 {
4756         /* create the header block */
4757         ir_node *header_block = new_immBlock();
4758
4759         /* the loop body */
4760         ir_node *body_block = new_immBlock();
4761         jump_to(body_block);
4762
4763         ir_node *old_continue_label = continue_label;
4764         ir_node *old_break_label    = break_label;
4765         continue_label              = header_block;
4766         break_label                 = NULL;
4767
4768         set_cur_block(body_block);
4769         statement_to_firm(statement->body);
4770         ir_node *const false_block = get_break_label();
4771
4772         assert(continue_label == header_block);
4773         continue_label = old_continue_label;
4774         break_label    = old_break_label;
4775
4776         jump_if_reachable(header_block);
4777
4778         /* create the condition */
4779         mature_immBlock(header_block);
4780         set_cur_block(header_block);
4781
4782         create_condition_evaluation(statement->condition, body_block, false_block);
4783         mature_immBlock(body_block);
4784         mature_immBlock(false_block);
4785
4786         set_cur_block(false_block);
4787         return NULL;
4788 }
4789
4790 static ir_node *for_statement_to_firm(for_statement_t *statement)
4791 {
4792         /* create declarations */
4793         entity_t *entity = statement->scope.entities;
4794         for ( ; entity != NULL; entity = entity->base.next) {
4795                 if (!is_declaration(entity))
4796                         continue;
4797
4798                 create_local_declaration(entity);
4799         }
4800
4801         if (currently_reachable()) {
4802                 entity = statement->scope.entities;
4803                 for ( ; entity != NULL; entity = entity->base.next) {
4804                         if (!is_declaration(entity))
4805                                 continue;
4806
4807                         initialize_local_declaration(entity);
4808                 }
4809
4810                 if (statement->initialisation != NULL) {
4811                         expression_to_firm(statement->initialisation);
4812                 }
4813         }
4814
4815         /* Create the header block */
4816         ir_node *const header_block = new_immBlock();
4817         jump_to(header_block);
4818
4819         /* Create the condition. */
4820         ir_node *body_block;
4821         ir_node *false_block;
4822         if (statement->condition != NULL) {
4823                 body_block  = new_immBlock();
4824                 false_block = new_immBlock();
4825
4826                 set_cur_block(header_block);
4827                 create_condition_evaluation(statement->condition, body_block, false_block);
4828                 mature_immBlock(body_block);
4829         } else {
4830                 /* for-ever. */
4831                 body_block  = header_block;
4832                 false_block = NULL;
4833
4834                 keep_alive(header_block);
4835                 keep_all_memory(header_block);
4836         }
4837
4838         /* Create the step block, if necessary. */
4839         ir_node      *      step_block = header_block;
4840         expression_t *const step       = statement->step;
4841         if (step != NULL) {
4842                 step_block = new_immBlock();
4843         }
4844
4845         ir_node *const old_continue_label = continue_label;
4846         ir_node *const old_break_label    = break_label;
4847         continue_label = step_block;
4848         break_label    = false_block;
4849
4850         /* Create the loop body. */
4851         set_cur_block(body_block);
4852         statement_to_firm(statement->body);
4853         jump_if_reachable(step_block);
4854
4855         /* Create the step code. */
4856         if (step != NULL) {
4857                 mature_immBlock(step_block);
4858                 set_cur_block(step_block);
4859                 expression_to_firm(step);
4860                 jump_if_reachable(header_block);
4861         }
4862
4863         mature_immBlock(header_block);
4864         assert(false_block == NULL || false_block == break_label);
4865         false_block = break_label;
4866         if (false_block != NULL) {
4867                 mature_immBlock(false_block);
4868         }
4869         set_cur_block(false_block);
4870
4871         assert(continue_label == step_block);
4872         continue_label = old_continue_label;
4873         break_label    = old_break_label;
4874         return NULL;
4875 }
4876
4877 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4878 {
4879         if (!currently_reachable())
4880                 return NULL;
4881
4882         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4883         ir_node  *jump = new_d_Jmp(dbgi);
4884         add_immBlock_pred(target_block, jump);
4885
4886         set_unreachable_now();
4887         return NULL;
4888 }
4889
4890 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4891 {
4892         /* determine number of cases */
4893         size_t n_cases = 0;
4894         for (case_label_statement_t *l = statement->first_case; l != NULL;
4895              l = l->next) {
4896                 /* default case */
4897                 if (l->expression == NULL)
4898                         continue;
4899                 if (l->is_empty_range)
4900                         continue;
4901                 ++n_cases;
4902         }
4903
4904         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4905         size_t           i   = 0;
4906         for (case_label_statement_t *l = statement->first_case; l != NULL;
4907              l = l->next) {
4908             if (l->expression == NULL) {
4909                         l->pn = pn_Switch_default;
4910                         continue;
4911                 }
4912                 if (l->is_empty_range)
4913                         continue;
4914                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4915                 ir_tarval *max = min;
4916                 long       pn  = (long) i+1;
4917                 if (l->end_range != NULL)
4918                         max = fold_constant_to_tarval(l->end_range);
4919                 ir_switch_table_set(res, i++, min, max, pn);
4920                 l->pn = pn;
4921         }
4922         return res;
4923 }
4924
4925 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4926 {
4927         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4928         ir_node  *switch_node = NULL;
4929
4930         if (currently_reachable()) {
4931                 ir_node *expression = expression_to_firm(statement->expression);
4932                 ir_switch_table *table = create_switch_table(statement);
4933                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4934
4935                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4936         }
4937
4938         set_unreachable_now();
4939
4940         ir_node *const old_switch            = current_switch;
4941         ir_node *const old_break_label       = break_label;
4942         const bool     old_saw_default_label = saw_default_label;
4943         saw_default_label                    = false;
4944         current_switch                       = switch_node;
4945         break_label                          = NULL;
4946
4947         statement_to_firm(statement->body);
4948
4949         if (currently_reachable()) {
4950                 add_immBlock_pred(get_break_label(), new_Jmp());
4951         }
4952
4953         if (!saw_default_label && switch_node) {
4954                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4955                 add_immBlock_pred(get_break_label(), proj);
4956         }
4957
4958         if (break_label != NULL) {
4959                 mature_immBlock(break_label);
4960         }
4961         set_cur_block(break_label);
4962
4963         assert(current_switch == switch_node);
4964         current_switch    = old_switch;
4965         break_label       = old_break_label;
4966         saw_default_label = old_saw_default_label;
4967         return NULL;
4968 }
4969
4970 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4971 {
4972         if (statement->is_empty_range)
4973                 return NULL;
4974
4975         if (current_switch != NULL) {
4976                 ir_node *block = new_immBlock();
4977                 /* Fallthrough from previous case */
4978                 jump_if_reachable(block);
4979
4980                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4981                 add_immBlock_pred(block, proj);
4982                 if (statement->expression == NULL)
4983                         saw_default_label = true;
4984
4985                 mature_immBlock(block);
4986                 set_cur_block(block);
4987         }
4988
4989         return statement_to_firm(statement->statement);
4990 }
4991
4992 static ir_node *label_to_firm(const label_statement_t *statement)
4993 {
4994         ir_node *block = get_label_block(statement->label);
4995         jump_to(block);
4996
4997         set_cur_block(block);
4998         keep_alive(block);
4999         keep_all_memory(block);
5000
5001         return statement_to_firm(statement->statement);
5002 }
5003
5004 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
5005 {
5006         if (!currently_reachable())
5007                 return NULL;
5008
5009         ir_node  *const irn  = expression_to_firm(statement->expression);
5010         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5011         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5012
5013         set_irn_link(ijmp, ijmp_list);
5014         ijmp_list = ijmp;
5015
5016         set_unreachable_now();
5017         return NULL;
5018 }
5019
5020 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
5021 {
5022         bool needs_memory = false;
5023
5024         if (statement->is_volatile) {
5025                 needs_memory = true;
5026         }
5027
5028         size_t         n_clobbers = 0;
5029         asm_clobber_t *clobber    = statement->clobbers;
5030         for ( ; clobber != NULL; clobber = clobber->next) {
5031                 const char *clobber_str = clobber->clobber.begin;
5032
5033                 if (!be_is_valid_clobber(clobber_str)) {
5034                         errorf(&statement->base.source_position,
5035                                    "invalid clobber '%s' specified", clobber->clobber);
5036                         continue;
5037                 }
5038
5039                 if (streq(clobber_str, "memory")) {
5040                         needs_memory = true;
5041                         continue;
5042                 }
5043
5044                 ident *id = new_id_from_str(clobber_str);
5045                 obstack_ptr_grow(&asm_obst, id);
5046                 ++n_clobbers;
5047         }
5048         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5049         ident **clobbers = NULL;
5050         if (n_clobbers > 0) {
5051                 clobbers = obstack_finish(&asm_obst);
5052         }
5053
5054         size_t n_inputs  = 0;
5055         asm_argument_t *argument = statement->inputs;
5056         for ( ; argument != NULL; argument = argument->next)
5057                 n_inputs++;
5058         size_t n_outputs = 0;
5059         argument = statement->outputs;
5060         for ( ; argument != NULL; argument = argument->next)
5061                 n_outputs++;
5062
5063         unsigned next_pos = 0;
5064
5065         ir_node *ins[n_inputs + n_outputs + 1];
5066         size_t   in_size = 0;
5067
5068         ir_asm_constraint tmp_in_constraints[n_outputs];
5069
5070         const expression_t *out_exprs[n_outputs];
5071         ir_node            *out_addrs[n_outputs];
5072         size_t              out_size = 0;
5073
5074         argument = statement->outputs;
5075         for ( ; argument != NULL; argument = argument->next) {
5076                 const char *constraints = argument->constraints.begin;
5077                 asm_constraint_flags_t asm_flags
5078                         = be_parse_asm_constraints(constraints);
5079
5080                 {
5081                         source_position_t const *const pos = &statement->base.source_position;
5082                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5083                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5084                         }
5085                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5086                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5087                                 continue;
5088                         }
5089                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5090                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5091                                 continue;
5092                         }
5093                 }
5094
5095                 unsigned pos = next_pos++;
5096                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5097                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5098                         expression_t *expr = argument->expression;
5099                         ir_node      *addr = expression_to_addr(expr);
5100                         /* in+output, construct an artifical same_as constraint on the
5101                          * input */
5102                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5103                                 char     buf[64];
5104                                 ir_node *value = get_value_from_lvalue(expr, addr);
5105
5106                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5107
5108                                 ir_asm_constraint constraint;
5109                                 constraint.pos              = pos;
5110                                 constraint.constraint       = new_id_from_str(buf);
5111                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5112                                 tmp_in_constraints[in_size] = constraint;
5113                                 ins[in_size] = value;
5114
5115                                 ++in_size;
5116                         }
5117
5118                         out_exprs[out_size] = expr;
5119                         out_addrs[out_size] = addr;
5120                         ++out_size;
5121                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5122                         /* pure memory ops need no input (but we have to make sure we
5123                          * attach to the memory) */
5124                         assert(! (asm_flags &
5125                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5126                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5127                         needs_memory = true;
5128
5129                         /* we need to attach the address to the inputs */
5130                         expression_t *expr = argument->expression;
5131
5132                         ir_asm_constraint constraint;
5133                         constraint.pos              = pos;
5134                         constraint.constraint       = new_id_from_str(constraints);
5135                         constraint.mode             = mode_M;
5136                         tmp_in_constraints[in_size] = constraint;
5137
5138                         ins[in_size]          = expression_to_addr(expr);
5139                         ++in_size;
5140                         continue;
5141                 } else {
5142                         errorf(&statement->base.source_position,
5143                                "only modifiers but no place set in constraints '%s'",
5144                                constraints);
5145                         continue;
5146                 }
5147
5148                 ir_asm_constraint constraint;
5149                 constraint.pos        = pos;
5150                 constraint.constraint = new_id_from_str(constraints);
5151                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5152
5153                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5154         }
5155         assert(obstack_object_size(&asm_obst)
5156                         == out_size * sizeof(ir_asm_constraint));
5157         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5158
5159
5160         obstack_grow(&asm_obst, tmp_in_constraints,
5161                      in_size * sizeof(tmp_in_constraints[0]));
5162         /* find and count input and output arguments */
5163         argument = statement->inputs;
5164         for ( ; argument != NULL; argument = argument->next) {
5165                 const char *constraints = argument->constraints.begin;
5166                 asm_constraint_flags_t asm_flags
5167                         = be_parse_asm_constraints(constraints);
5168
5169                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5170                         errorf(&statement->base.source_position,
5171                                "some constraints in '%s' are not supported", constraints);
5172                         continue;
5173                 }
5174                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5175                         errorf(&statement->base.source_position,
5176                                "some constraints in '%s' are invalid", constraints);
5177                         continue;
5178                 }
5179                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5180                         errorf(&statement->base.source_position,
5181                                "write flag specified for input constraints '%s'",
5182                                constraints);
5183                         continue;
5184                 }
5185
5186                 ir_node *input;
5187                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5188                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5189                         /* we can treat this as "normal" input */
5190                         input = expression_to_firm(argument->expression);
5191                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5192                         /* pure memory ops need no input (but we have to make sure we
5193                          * attach to the memory) */
5194                         assert(! (asm_flags &
5195                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5196                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5197                         needs_memory = true;
5198                         input = expression_to_addr(argument->expression);
5199                 } else {
5200                         errorf(&statement->base.source_position,
5201                                "only modifiers but no place set in constraints '%s'",
5202                                constraints);
5203                         continue;
5204                 }
5205
5206                 ir_asm_constraint constraint;
5207                 constraint.pos        = next_pos++;
5208                 constraint.constraint = new_id_from_str(constraints);
5209                 constraint.mode       = get_irn_mode(input);
5210
5211                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5212                 ins[in_size++] = input;
5213         }
5214
5215         if (needs_memory) {
5216                 ir_asm_constraint constraint;
5217                 constraint.pos        = next_pos++;
5218                 constraint.constraint = new_id_from_str("");
5219                 constraint.mode       = mode_M;
5220
5221                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5222                 ins[in_size++] = get_store();
5223         }
5224
5225         assert(obstack_object_size(&asm_obst)
5226                         == in_size * sizeof(ir_asm_constraint));
5227         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5228
5229         /* create asm node */
5230         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5231
5232         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5233
5234         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5235                                   out_size, output_constraints,
5236                                   n_clobbers, clobbers, asm_text);
5237
5238         if (statement->is_volatile) {
5239                 set_irn_pinned(node, op_pin_state_pinned);
5240         } else {
5241                 set_irn_pinned(node, op_pin_state_floats);
5242         }
5243
5244         /* create output projs & connect them */
5245         if (needs_memory) {
5246                 ir_node *projm = new_Proj(node, mode_M, out_size);
5247                 set_store(projm);
5248         }
5249
5250         size_t i;
5251         for (i = 0; i < out_size; ++i) {
5252                 const expression_t *out_expr = out_exprs[i];
5253                 long                pn       = i;
5254                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5255                 ir_node            *proj     = new_Proj(node, mode, pn);
5256                 ir_node            *addr     = out_addrs[i];
5257
5258                 set_value_for_expression_addr(out_expr, proj, addr);
5259         }
5260
5261         return NULL;
5262 }
5263
5264 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5265 {
5266         statement_to_firm(statement->try_statement);
5267         source_position_t const *const pos = &statement->base.source_position;
5268         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5269         return NULL;
5270 }
5271
5272 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5273 {
5274         errorf(&statement->base.source_position, "__leave not supported yet");
5275         return NULL;
5276 }
5277
5278 /**
5279  * Transform a statement.
5280  */
5281 static ir_node *statement_to_firm(statement_t *const stmt)
5282 {
5283 #ifndef NDEBUG
5284         assert(!stmt->base.transformed);
5285         stmt->base.transformed = true;
5286 #endif
5287
5288         switch (stmt->kind) {
5289         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5290         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5291         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5292         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5293         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5294         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5295         case STATEMENT_EMPTY:         return NULL; /* nothing */
5296         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5297         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5298         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5299         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5300         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5301         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5302         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5303         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5304         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5305
5306         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5307         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5308         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5309
5310         case STATEMENT_ERROR: panic("error statement found");
5311         }
5312         panic("statement not implemented");
5313 }
5314
5315 static int count_local_variables(const entity_t *entity,
5316                                  const entity_t *const last)
5317 {
5318         int count = 0;
5319         entity_t const *const end = last != NULL ? last->base.next : NULL;
5320         for (; entity != end; entity = entity->base.next) {
5321                 type_t *type;
5322                 bool    address_taken;
5323
5324                 if (entity->kind == ENTITY_VARIABLE) {
5325                         type          = skip_typeref(entity->declaration.type);
5326                         address_taken = entity->variable.address_taken;
5327                 } else if (entity->kind == ENTITY_PARAMETER) {
5328                         type          = skip_typeref(entity->declaration.type);
5329                         address_taken = entity->parameter.address_taken;
5330                 } else {
5331                         continue;
5332                 }
5333
5334                 if (!address_taken && is_type_scalar(type))
5335                         ++count;
5336         }
5337         return count;
5338 }
5339
5340 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5341 {
5342         int *const count = env;
5343
5344         switch (stmt->kind) {
5345         case STATEMENT_DECLARATION: {
5346                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5347                 *count += count_local_variables(decl_stmt->declarations_begin,
5348                                 decl_stmt->declarations_end);
5349                 break;
5350         }
5351
5352         case STATEMENT_FOR:
5353                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5354                 break;
5355
5356         default:
5357                 break;
5358         }
5359 }
5360
5361 /**
5362  * Return the number of local (alias free) variables used by a function.
5363  */
5364 static int get_function_n_local_vars(entity_t *entity)
5365 {
5366         const function_t *function = &entity->function;
5367         int count = 0;
5368
5369         /* count parameters */
5370         count += count_local_variables(function->parameters.entities, NULL);
5371
5372         /* count local variables declared in body */
5373         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5374         return count;
5375 }
5376
5377 /**
5378  * Build Firm code for the parameters of a function.
5379  */
5380 static void initialize_function_parameters(entity_t *entity)
5381 {
5382         assert(entity->kind == ENTITY_FUNCTION);
5383         ir_graph *irg             = current_ir_graph;
5384         ir_node  *args            = get_irg_args(irg);
5385         int       n               = 0;
5386         ir_type  *function_irtype;
5387
5388         if (entity->function.need_closure) {
5389                 /* add an extra parameter for the static link */
5390                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5391                 ++n;
5392
5393                 /* Matze: IMO this is wrong, nested functions should have an own
5394                  * type and not rely on strange parameters... */
5395                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5396         } else {
5397                 function_irtype = get_ir_type(entity->declaration.type);
5398         }
5399
5400
5401
5402         entity_t *parameter = entity->function.parameters.entities;
5403         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5404                 if (parameter->kind != ENTITY_PARAMETER)
5405                         continue;
5406
5407                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5408                 type_t *type = skip_typeref(parameter->declaration.type);
5409
5410                 bool needs_entity = parameter->parameter.address_taken;
5411                 assert(!is_type_array(type));
5412                 if (is_type_compound(type)) {
5413                         needs_entity = true;
5414                 }
5415
5416                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5417                 if (needs_entity) {
5418                         ir_type   *frame_type = get_irg_frame_type(irg);
5419                         ir_entity *param
5420                                 = new_parameter_entity(frame_type, n, param_irtype);
5421                         parameter->declaration.kind
5422                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5423                         parameter->parameter.v.entity = param;
5424                         continue;
5425                 }
5426
5427                 ir_mode *param_mode = get_type_mode(param_irtype);
5428                 long     pn         = n;
5429                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5430
5431                 ir_mode *mode = get_ir_mode_storage(type);
5432                 value = create_conv(NULL, value, mode);
5433                 value = do_strict_conv(NULL, value);
5434
5435                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5436                 parameter->parameter.v.value_number = next_value_number_function;
5437                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5438                                         parameter);
5439                 ++next_value_number_function;
5440
5441                 set_value(parameter->parameter.v.value_number, value);
5442         }
5443 }
5444
5445 /**
5446  * Handle additional decl modifiers for IR-graphs
5447  *
5448  * @param irg            the IR-graph
5449  * @param dec_modifiers  additional modifiers
5450  */
5451 static void handle_decl_modifier_irg(ir_graph *irg,
5452                                      decl_modifiers_t decl_modifiers)
5453 {
5454         if (decl_modifiers & DM_NAKED) {
5455                 /* TRUE if the declaration includes the Microsoft
5456                    __declspec(naked) specifier. */
5457                 add_irg_additional_properties(irg, mtp_property_naked);
5458         }
5459         if (decl_modifiers & DM_FORCEINLINE) {
5460                 /* TRUE if the declaration includes the
5461                    Microsoft __forceinline specifier. */
5462                 set_irg_inline_property(irg, irg_inline_forced);
5463         }
5464         if (decl_modifiers & DM_NOINLINE) {
5465                 /* TRUE if the declaration includes the Microsoft
5466                    __declspec(noinline) specifier. */
5467                 set_irg_inline_property(irg, irg_inline_forbidden);
5468         }
5469 }
5470
5471 static void add_function_pointer(ir_type *segment, ir_entity *method,
5472                                  const char *unique_template)
5473 {
5474         ir_type   *method_type  = get_entity_type(method);
5475         ir_type   *ptr_type     = new_type_pointer(method_type);
5476
5477         /* these entities don't really have a name but firm only allows
5478          * "" in ld_ident.
5479          * Note that we mustn't give these entities a name since for example
5480          * Mach-O doesn't allow them. */
5481         ident     *ide          = id_unique(unique_template);
5482         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5483         ir_graph  *irg          = get_const_code_irg();
5484         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5485                                                            method);
5486
5487         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5488         set_entity_compiler_generated(ptr, 1);
5489         set_entity_visibility(ptr, ir_visibility_private);
5490         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5491         set_atomic_ent_value(ptr, val);
5492 }
5493
5494 /**
5495  * Generate possible IJmp branches to a given label block.
5496  */
5497 static void gen_ijmp_branches(ir_node *block)
5498 {
5499         ir_node *ijmp;
5500         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5501                 add_immBlock_pred(block, ijmp);
5502         }
5503 }
5504
5505 /**
5506  * Create code for a function and all inner functions.
5507  *
5508  * @param entity  the function entity
5509  */
5510 static void create_function(entity_t *entity)
5511 {
5512         assert(entity->kind == ENTITY_FUNCTION);
5513         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5514
5515         if (entity->function.statement == NULL)
5516                 return;
5517
5518         inner_functions     = NULL;
5519         current_trampolines = NULL;
5520
5521         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5522                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5523                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5524         }
5525         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5526                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5527                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5528         }
5529
5530         current_function_entity = entity;
5531         current_function_name   = NULL;
5532         current_funcsig         = NULL;
5533
5534         assert(all_labels == NULL);
5535         all_labels = NEW_ARR_F(label_t *, 0);
5536         ijmp_list  = NULL;
5537
5538         int       n_local_vars = get_function_n_local_vars(entity);
5539         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5540         current_ir_graph = irg;
5541
5542         ir_graph *old_current_function = current_function;
5543         current_function = irg;
5544
5545         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5546         current_vararg_entity = NULL;
5547
5548         set_irg_fp_model(irg, firm_fp_model);
5549         tarval_enable_fp_ops(1);
5550         set_irn_dbg_info(get_irg_start_block(irg),
5551                          get_entity_dbg_info(function_entity));
5552
5553         /* set inline flags */
5554         if (entity->function.is_inline)
5555                 set_irg_inline_property(irg, irg_inline_recomended);
5556         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5557
5558         next_value_number_function = 0;
5559         initialize_function_parameters(entity);
5560         current_static_link = entity->function.static_link;
5561
5562         statement_to_firm(entity->function.statement);
5563
5564         ir_node *end_block = get_irg_end_block(irg);
5565
5566         /* do we have a return statement yet? */
5567         if (currently_reachable()) {
5568                 type_t *type = skip_typeref(entity->declaration.type);
5569                 assert(is_type_function(type));
5570                 type_t *const return_type = skip_typeref(type->function.return_type);
5571
5572                 ir_node *ret;
5573                 if (is_type_void(return_type)) {
5574                         ret = new_Return(get_store(), 0, NULL);
5575                 } else {
5576                         ir_mode *const mode = get_ir_mode_storage(return_type);
5577
5578                         ir_node *in[1];
5579                         /* §5.1.2.2.3 main implicitly returns 0 */
5580                         if (is_main(entity)) {
5581                                 in[0] = new_Const(get_mode_null(mode));
5582                         } else {
5583                                 in[0] = new_Unknown(mode);
5584                         }
5585                         ret = new_Return(get_store(), 1, in);
5586                 }
5587                 add_immBlock_pred(end_block, ret);
5588         }
5589
5590         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5591                 label_t *label = all_labels[i];
5592                 if (label->address_taken) {
5593                         gen_ijmp_branches(label->block);
5594                 }
5595                 mature_immBlock(label->block);
5596         }
5597
5598         DEL_ARR_F(all_labels);
5599         all_labels = NULL;
5600
5601         irg_finalize_cons(irg);
5602
5603         /* finalize the frame type */
5604         ir_type *frame_type = get_irg_frame_type(irg);
5605         int      n          = get_compound_n_members(frame_type);
5606         int      align_all  = 4;
5607         int      offset     = 0;
5608         for (int i = 0; i < n; ++i) {
5609                 ir_entity *member      = get_compound_member(frame_type, i);
5610                 ir_type   *entity_type = get_entity_type(member);
5611
5612                 int align = get_type_alignment_bytes(entity_type);
5613                 if (align > align_all)
5614                         align_all = align;
5615                 int misalign = 0;
5616                 if (align > 0) {
5617                         misalign  = offset % align;
5618                         if (misalign > 0) {
5619                                 offset += align - misalign;
5620                         }
5621                 }
5622
5623                 set_entity_offset(member, offset);
5624                 offset += get_type_size_bytes(entity_type);
5625         }
5626         set_type_size_bytes(frame_type, offset);
5627         set_type_alignment_bytes(frame_type, align_all);
5628
5629         irg_verify(irg, VERIFY_ENFORCE_SSA);
5630         current_vararg_entity = old_current_vararg_entity;
5631         current_function      = old_current_function;
5632
5633         if (current_trampolines != NULL) {
5634                 DEL_ARR_F(current_trampolines);
5635                 current_trampolines = NULL;
5636         }
5637
5638         /* create inner functions if any */
5639         entity_t **inner = inner_functions;
5640         if (inner != NULL) {
5641                 ir_type *rem_outer_frame      = current_outer_frame;
5642                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5643                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5644                         create_function(inner[i]);
5645                 }
5646                 DEL_ARR_F(inner);
5647
5648                 current_outer_frame      = rem_outer_frame;
5649         }
5650 }
5651
5652 static void scope_to_firm(scope_t *scope)
5653 {
5654         /* first pass: create declarations */
5655         entity_t *entity = scope->entities;
5656         for ( ; entity != NULL; entity = entity->base.next) {
5657                 if (entity->base.symbol == NULL)
5658                         continue;
5659
5660                 if (entity->kind == ENTITY_FUNCTION) {
5661                         if (entity->function.btk != BUILTIN_NONE) {
5662                                 /* builtins have no representation */
5663                                 continue;
5664                         }
5665                         (void)get_function_entity(entity, NULL);
5666                 } else if (entity->kind == ENTITY_VARIABLE) {
5667                         create_global_variable(entity);
5668                 } else if (entity->kind == ENTITY_NAMESPACE) {
5669                         scope_to_firm(&entity->namespacee.members);
5670                 }
5671         }
5672
5673         /* second pass: create code/initializers */
5674         entity = scope->entities;
5675         for ( ; entity != NULL; entity = entity->base.next) {
5676                 if (entity->base.symbol == NULL)
5677                         continue;
5678
5679                 if (entity->kind == ENTITY_FUNCTION) {
5680                         if (entity->function.btk != BUILTIN_NONE) {
5681                                 /* builtins have no representation */
5682                                 continue;
5683                         }
5684                         create_function(entity);
5685                 } else if (entity->kind == ENTITY_VARIABLE) {
5686                         assert(entity->declaration.kind
5687                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5688                         current_ir_graph = get_const_code_irg();
5689                         create_variable_initializer(entity);
5690                 }
5691         }
5692 }
5693
5694 void init_ast2firm(void)
5695 {
5696         obstack_init(&asm_obst);
5697         init_atomic_modes();
5698
5699         ir_set_debug_retrieve(dbg_retrieve);
5700         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5701
5702         /* create idents for all known runtime functions */
5703         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5704                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5705         }
5706
5707         entitymap_init(&entitymap);
5708 }
5709
5710 static void init_ir_types(void)
5711 {
5712         static int ir_types_initialized = 0;
5713         if (ir_types_initialized)
5714                 return;
5715         ir_types_initialized = 1;
5716
5717         ir_type_char       = get_ir_type(type_char);
5718         ir_type_const_char = get_ir_type(type_const_char);
5719         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5720
5721         be_params             = be_get_backend_param();
5722         mode_float_arithmetic = be_params->mode_float_arithmetic;
5723
5724         stack_param_align     = be_params->stack_param_align;
5725 }
5726
5727 void exit_ast2firm(void)
5728 {
5729         entitymap_destroy(&entitymap);
5730         obstack_free(&asm_obst, NULL);
5731 }
5732
5733 static void global_asm_to_firm(statement_t *s)
5734 {
5735         for (; s != NULL; s = s->base.next) {
5736                 assert(s->kind == STATEMENT_ASM);
5737
5738                 char const *const text = s->asms.asm_text.begin;
5739                 size_t            size = s->asms.asm_text.size;
5740
5741                 /* skip the last \0 */
5742                 if (text[size - 1] == '\0')
5743                         --size;
5744
5745                 ident *const id = new_id_from_chars(text, size);
5746                 add_irp_asm(id);
5747         }
5748 }
5749
5750 static const char *get_cwd(void)
5751 {
5752         static char buf[1024];
5753         if (buf[0] == '\0')
5754                 getcwd(buf, sizeof(buf));
5755         return buf;
5756 }
5757
5758 void translation_unit_to_firm(translation_unit_t *unit)
5759 {
5760         if (c_mode & _CXX) {
5761                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5762         } else if (c_mode & _C99) {
5763                 be_dwarf_set_source_language(DW_LANG_C99);
5764         } else if (c_mode & _C89) {
5765                 be_dwarf_set_source_language(DW_LANG_C89);
5766         } else {
5767                 be_dwarf_set_source_language(DW_LANG_C);
5768         }
5769         be_dwarf_set_compilation_directory(get_cwd());
5770
5771         /* initialize firm arithmetic */
5772         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5773         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5774
5775         /* just to be sure */
5776         continue_label           = NULL;
5777         break_label              = NULL;
5778         current_switch           = NULL;
5779         current_translation_unit = unit;
5780
5781         init_ir_types();
5782
5783         scope_to_firm(&unit->scope);
5784         global_asm_to_firm(unit->global_asm);
5785
5786         current_ir_graph         = NULL;
5787         current_translation_unit = NULL;
5788 }